GREAT work for a first digital artwork. For a beginner you're doing really well, keep doing what you're doing and keep yourself motivated and you'll see improvement comes quite quickly! 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. The subject is the only thing I have a problem with, painting an eye, with no context or reason simply because it looks interesting, happens a lot and doesn't give me much new to experience as a viewer. I look forward to seeing what you do with new subject matter! Keep up the effort, and thanks for sharing your work with me!