Feeling rusty with Landscapes

Been awhile since I actually painted other than bits and pieces or illustrations..........particularly landscapes.  Boy do I feel lost and extremely rusty!!!  I used a 1/2" Flat on these and the size of each is only about 3 x 2 1/2".  I was a bit heavy handed with the pigment too........especially with the top two.  I need to work on that. 

Using only a blue and brown with these.

Didn't achieve any real depth as I would have liked with the top two.....well at least from foreground to mountain ridges.  I did achieve some depth within the mountain ridges......that part I'm somewhat OK with.  I think the brown should have been more muted from the foreground browns.

As for the bottom two..........I prefer the foreground in the left landscape and the distant hills in the right.