This looks like a good tileset, and I like the hand drawn look, but those blue-ish background tiles might be a bit problematic. If you look at the green rocks that stand out, you'll see they form a sort of grid pattern. Also, the contrast is fairly high, and it can be seen that it is just one tile repeating over and over. I would suggest adding more tiles so the BG is more natural looking.

Now that I think of it, the same applies to the leaf texture in the first screenshot. There is a grid of large oval shaped leaves (two in each tile) which stands out. Again, more variation would solve the issue.