The thing that felt off to me were te eyes. I couldn't quite decide what it was about them so i looked up some images and stumbled upon the one you referenced. Honestly, I still can't tell why. Also I do think the shading could use some work. The lighting of the hair in particular could be improved, by leaving some whites of the page open. Just like you did with the very right side of her face.

Everything else feels great, I think you are being to hard on yourself. You included enough details of the game to make the overall image look less generic, but still managed to keep it nice and simple. That's what I like the most about this piece.

You may lack some technical and observational skills, but that is resolved with practise. The thing I think you are close to mastering is probably proven most difficult, which is appeal. Keep up the good work.