The blockiness in the cliffs is the farthest it can go. I noticed it's almost impossible for cliffs to be blockless; if you looked closely at any cliff, I bet you would see some blocks. Even Rantent's cliffs have some too, its just not noticeable because his pieces are in jpg format.
Edit: I have been proven wrong about the above. Now I feel stupid.anyways, I'm working at improving my sprite placements. It's kind of hard, since I have to place them well while blocking essential areas.
ADDITION:
I'm still unsure on the traps.

What should I do in between the traps and cliff?
I've tried making bush sprites, but they didn't turn out very good.