I don't think your cosplay looks too bad actually! I'm not familiar with the character, but after looking at some references and gifs, I'd suggest the following improvements:
-More dramatic eye makeup. Your makeup looks cute in close-up shots like this one
, but your eyes kind of disappear in your other pictures. It looks like the character has some pretty impressive winged eyeliner, so I would add that to your own makeup. Don't be shy about putting the eyeliner on a bit thicker than you normally would. (but be careful not to go too overboard!) I also suggest using some eye shadow to make your eyebrows match your wig color; it's always a nice touch.
Also, in the references I looked at, it looks like she has small cat whisker lines on her cheeks, so I would add those too.
-For the wig, maybe try something a bit longer and use some hairspray to poof it up a bit. This character's hair is full of fluffy layers and volume, and seems to kinda go in all directions. Maybe something like Epic Cosplay's Apollo in copper red could be styled to suit your cosplay.
-For the costume, your choices of colors look really accurate and the craftsmanship of the shirt really isn't too bad! If you were willing to re-make it, however, I suggest widening the neckline and making it closer to an off-the-shoulder top, like in this image
Lastly, you could also try wearing colored contacts and some fang tooth caps to match her green eyes and little pointed teeth. However I know both of those can be uncomfortable and contacts are pricey; they're just nice touches.
I hope this is helpful!