Hey, this is really neat. The background looks amazing and I can see you put a lot of effort into it.

Your art has lots of potential, but I think a thing you really have to think about is your proportions. The eyes could be shifted around the nose and mouth. Perhaps bringing the nose and mouth more to the right could help make the face look more symmetrical in its proportions. I know it's difficult with the position you chose, but I feel like your art can flourish so much more if you just get the facial proportions down. You could even take the eye on the right of the illustration and bring it close to the nose and mouth. Just to make the two eyes look equal distance from the eye, even though you've got an angle.

Another thing is the hands. They don't look right. I know it's a common joke around artists that the hands are the demons of drawing, but it's a really important thing to get down. Once you get your hands down, it opens up so many positions you can put them in. I do applaud you for not simply hiding them.

I would recommend focusing on your proportions first before worrying too much about drawing a lot of detail. Proportions are really important and is what could make or break a drawing.

Apologies if it sounds like I'm just flaming your drawing. I'm not trying to. I feel that you can go far with your drawing so that is why I am trying to give you pointers on where you could improve. I hope this helps!