For your first digital piece you should be proud! The image is good, there are some things holding it back though, the most noticeable thing being how 'busy' the image is. If you're starting off and learning I'd recommend taking it slow, working on character art or environments separate to each other, and when you progress to a point you're happy with, keep challenging yourself and combine them in adventurous ways. Overall a good attempt though, keep it up and thanks for sharing