Several posts I've made have been Ink and Wash using a Tombow Dual Marker Brush/Pen and Waterbrush. Another pen is the Rotring but for some reason I seem to prefer grabbing the Tombow Marker. Part of the reason is that now and then the black breaks down showing blue and pinks whereas the Rotring does not.
The Tombow is there in the center with the end caps taken off. One side is like a brush pen whereas the other is a finer nylon nib for finer detailing.
Here is an example showing steps with one of my birds I posted some time ago:
First I use a pencil and sketch my subject;
Next I outline and fill in areas with the Tombow Marker. You can see where I've marked with the black. A gray marker was also used within the body area for a lighter tone but not showing well in these illustrations. The gray may seem as dark as the black until you take a wet brush to it.
Another demo I did earlier is
here and I followed the same method with this one;
Taking either a Round Brush and water or Waterbrush, I go along the edges wetting the ink and pulling in towards the center.
If after it's dried I need to darken some of the areas, I will take my Tombow Marker with the brush end and scribble ink onto an acrylic surface (plastic butter lid will work or even a bad DVD) and with my brush and water or Waterbrush, mix up a pool of ink to apply to my sketch. You don't necessarily have to wait for the sketch to dry as you can drop in darker ink from that pool you mixed like you would with a watercolor mix.
The Tombow Marker Brushes come in various colors but do not behave the same. Some do not bleed as well as others and only experimenting will you learn which work best for what you are hoping to achieve. I prefer using the black more than any other ink color.
If you click on the color chart, the size should hopefully give you an idea of how well the ink "moves" or bleeds when water is applied to it.
You can get Tombow Markers at many of the online art supply distributors like
Dickblick. (This link will take you straight to the Tombow page giving more information and showing the available sets you can get.) Check out eBay and also Amazon. I normally order through Dickblick but have on occasion purchased marker and pen sets through Amazon.
Several posts I've made have been Ink and Wash using a Tombow Dual Marker Brush/Pen and Waterbrush. Another pen is the Rotring but for some reason I seem to prefer grabbing the Tombow Marker. Part of the reason is that now and then the black breaks down showing blue and pinks whereas the Rotring does not.
The Tombow Marker Brushes come in various colors but do not behave the same. Some do not bleed as well as others and only experimenting will you learn which work best for what you are hoping to achieve. I prefer using the black more than any other ink color.
This is using my black Tombow Brush Marker and waterbrush. Only tree around behind us that has this fungi growing, which seems odd. You'd think there would be others as well. The fungi is growing fairly high up on the trunk above our heads. 
I am adding my own twist to the basic sketching technique with a little added pen and ink for final detailing. Also with this sketch, I splashed a bit of green in the nest for added interest. I did that to denote the mossy look of their nests. Technically speaking, however, I probably should have added a splash of color to the hummer instead since it's my main subject. Next time, maybe :) I was just having fun and didn't think about that until after the fact.
I'm much happier with the proportions with this one (as my notes indicate). Not knowing enough about animal anatomy, I do lack in portraying muscle. Something I need to study and work on.
This is a sheet in my journal book practicing the wet n wet technique. I started with the left side and first go didn't turn out. My mix was too thick and found myself having to force it with too much brush work.
Here's an ink and wash of a lily plant my eldest son and his wife gave me as a gift for Mother's Day.
Today I was in a better frame of mind and think it reflects in the results. At least I enjoyed what I was doing without the uncertainties I felt yesterday.
Most people cringe when they see these popping up in their lawns. I must be strange because I love the yellow flower heads and think it's unique how they all turn to white tiny fairies flying around in the air. Of course hubby will be out with his weed and feed and these will all be gone. Until then I'll silently take in the bright yellows popping up amongst the dark greens.
These little leafy plants are also popping up all over the place. They are very small and mid to dark green. They remind me of a wild strawberry only I think strawberry plants they have three leaf clusters rather than five. These are not in the poison family although they do remind me of them as well. Too small.
Our mobile home or home away from home is located in a field. If the field is left to grow without cutting, the grasses are light golden brown and very tall. Of an early evening, the tall grassy field has this golden glow as the sun is lowering in the sky. 
While babysitting the granddaughters, there was a box on the counter that had this design. This is just a quick sketch of that design. 
Top two rocks (left and right) is using watercolor and a flat angular brush. The pigment consistency is rather thick like one might expect with acrylic paint.
Our home away from home sits right on the edge of the woods. Throughout the forest area are many downed trees that have been down for some time. This one in particular grabs our eyes due to how the inside is hollow and the edges curling inwards.
This has been done for both the 75 Day Sketch Challenge and a sketch challenge that was set in the forum I'm active in. The challenge in the forum is drawing Spring Flowers. Kind of follows suit with what I've been doing already with previous posts.
