First digital illustration? What ambition! It's clear to me that you really challenged yourself with this piece, you're trying various advanced techniques which are really hard to get right, and while some areas aren't perfect, the ambition and care taken bring it to a level of which you should be proud. Overall there's plenty of room for improvement but your leap into the artwork is great, I love your use of foreshortening and composition. great job, thanks for sharing, keep it up!