I feel like the sketchy trees on the hills could use little more work, but I'm going to leave it for now. ETA: fixed 'em.
It was kind of interesting to watch this one develop, so I thought I'd post the stages it went through: Stage 1, the pencil sketch:
Stage 2, the basic shapes and colors established in Illustrator:
Stage 3, adding paint in ArtRage:
Stage 4, adding texture and other finishing touches in Photoshop:
And finally back into Illustrator to drop it into my alphabet template: