I tried to give myself a challenge to see if I could get a bit more of an angle on the lighting. So the catch light is painted in. I also painted out your light that was in the middle of the pupil.
I agree with the quality of the image. Sometimes it is like the old saying that it takes two people to paint a watercolor. One to paint it and one to shoot them before they over work it.
I use that same phrase when it comes to PS. I played toooo much! Not because jpeg but I also did try to reduce the size and resend it back to my host. The more I fudged around with it made it worse. So I just let you see how it went so far.
I did try the Render filter that has lighting techniques. I have always had great hopes for that filter but it never really lives up to my wishes. Only in something that is well lit can I get a neat result from that. Flat lighting is just that = flat. Your design of the cat position is enough for me to want to play. If you give it a try - lets see your attempts at playing.
Good luck