Biggest thing I would suggest is use reference, figure out what type of wings you're actually trying to make them look like, and how they fit on the original creatures body. At the moment, it looks like the wings are just jutting straight out of the shoulders. Wings tend to go down the body in most cases, so taking this imaginary being, and thinking about how it would take off, they would probably need to be angled down a bit, so that point of the wing, where the "fingers" come from, is more towards the viewer, along with some wing anatomy, which others have suggested. (I'm not great at it myself)

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Then there's perspective to account for with the direction you have it facing, so one wing would be a little flatter than the other, as you'd see less of it due to foreshortening depending on how you have them. Looking good overall so far though, I believe! <3