Tekken fanart - Marduk: Gamechanger

[sopasdigital]

So here's what I've been up to today. This is my first digital painting that I really invested time on. So far I'm happy with what I've accomplished but I really need feedback on what else I can do to improve it (i.e. lighting, drapery, detail work, etc.)

Any suggestions? Comments? Would love if someone can do a paintover to highlight what I need to work on. Thank you!