Come on, I well be honest with you. Everything is wrong on your "work".
All you're doing is take hideous sprite from 90's video games, and then mix them together to have somehow a "landscape". It doesn't work. It's unoriginal. It's rubbish. Furthermore, you always take the same pattern: mountain + waterfall on background, trees on the feet of the mountain, lake/sea. It's not creative at all!
I'm a bit agressive but it's for your good.