Ehhh

It's just alright to me. I suck at landscapes too, but I think the main thing to consider is the overall composition first. For example, I like strong diagonals, so I structure the main lines around a diagonal. Then I try to figure out what kind of symmetry I want. You don't have to think about it too technically, but if you work it out abstractly first, you can fill in with objects.

Check out the Hudson river school painters, like Thomas Moran and Albert Bierstadt. You see a lot of U shapes or diamonds and squares in their paintings, where the foreground elements kind of frame the background and give it focus and depth.

Very Cool

I really like it. On first glance I would have said 10 but the longer I look the more I notice things. I think if you dropped the horizon lower it would look better; perhaps where the heavily green colored part ends and the brown begins. Lowering the horizon would make the cliff seem higher in comparison.

Also, the cliff is closer but seems smaller than the landscape below it. The grass on the bottom looks much larger and therefore closer the viewer.

Just a couple observations. Maybe I'm totally wrong, you're decision. But anyway, I really like it.

Cool

I really like the lighting.