This is a pretty good improvement, did you switch programs? Nice work on making the background much more realistic than before. The only thing I could say to improve is the anatomy, which I am not sure what kind of creature it is, so I can't help you there. Keep practicing, I see practicing has helped you improve this much
I am sorry you wre bullied about your art, or whatever they bullied you on. The thing is, if you ask for critiques, the person is supposed to tell you what is wrong with it. It is to help you, even if it hurts. I was very proud of one of my drawings once, and people said it was horrible. I didn't call it bullying, I just worked on practicing. Always practice, and you will get so much better, this drawing proves it!