Is good
Overall it's a decent picture. You show decent drawing skills as the lines are nice and straight and the colors and shading are nice and clear. There are lots of things going on in the picture (such as the blood coming out of the cave and the floating island) which keeps the viewer's eye busy yet there is plenty of room so the picture doesn't look cluttered or too busy. What's also really good is that you put one of the plants close to the viewer so the mind's eye can fill in the details on the plants that are far away.
My main complaint is that there isn't much to suggest the feet at the bottom are actually moving. As a result I wouldn't have known there. My other complaint is that paper and pencil crayon look crude (it's a personal preference but you never know how many others would agree). I'd recommend investing in a pen-tablet and something to the effect of photoshop.