On camera flash doesn't help this image.
Try to ues a more imaginitive lighting setup. Either try to get your flash off your camera, or use window lighting or a reflector to make things more interesting and softer.
Good detail on the fur. I think I would have included the mouth in the crop and/or angled it a bit more; the composition feels off to me. Not a fan of the glowing green pupils; I would suggest either bouncing the flash off the ceiling or in PP desaturating and darkening the greens or shifting the greens to brown and darkening.