pretty cat ;3 1.This 4th leg on the back is behing the cat so it should be more darker (shadows) and if you can point somewhere is the source of light ok ?
2.If the source of light is on the left then turn this blue bowl around ok and about the shadow I think it's good but if you want try 3 amount of colors on his neck (little darker grey,grey and white)
This is my fast edit of it