Oh my! That is beautiful. You asked for critiques and bearing in mind I am no artist, I looked very hard to pick on something. All I can say is that perhaps the paws are too blocky. From face to elbows everything has a cat's natural grace and bend but elbows to feet are less ... finished and soft.
My cats paws are delicate, soft and in the contemplative mood of your cat in the picture, definately the paws would be relaxed.
I feel guilty just picking on anything about that picture though. I wish I had your talent.