the colors are nice allready!
the face is looking a liddle bit flat and has also to many sharp edges. on the top of the head you can also see the silhouette of the skull and just some hair coming out of it. sometimes the hairstrands are also too straight i think.
what i would do is this:
the face is looking flat -> try to improve the lightning( for example more from the side)
silhouette of the skull-> you need here and there more hair make it fluffy! i think a cats silhouette is just defined by fur.
to make it more fluffy you can also try some deph of field in this shot. anyway its a close up and you would expect that.
ears are not round enough at the top
eyes are good in my opinion.