This is a good piece overall. I like the coloring technique you used and the composition. However, I feel that there are a couple of problems that need to be pointed out.
Drawing anime does not mean that you do not have to pay attention to the human anatomy. The girl's right leg looks ok to me, but her left leg and foot look a bit off to me. In fact, she appears to have two right legs. Her arms and hands also do not seem anatomically accurate to me. The solution is simple: Practice. Practice life drawing whenever you can. Also, there is absolutely nothing wrong with using photo-references as long as you do not trace them.
I have no idea what the creature next to the girl is, so I cannot say anything about its anatomy. Nonetheless, the expression on its face looks a bit blank to me.
Apart from that, I think you did a good job overall, though there is always room for improvement. Always remember that all it takes for you to improve is more practice.