Hi James,
Its not that they are unpleasing - but I do feel they kind of sit in the middle - either get it darker or add a bit of light back in. The problem for me is in the eyes - its a great pair of bright eyes your kitty has but one is really flat and dull (I'm talking about shots 1 & 3) and the other is bright with a nice catch light. Try going one way or the other.
Its tricky - photography is subjective and I will look at your pics in a different way to you and others (anyone else out their going to add their two-penneth?) Its further complicated by the fact that as its your cat you are "attached" and see things differently than if you were doing it for a customer.
If I get a chance on Sunday I will take my two cats to the studio and shoot some pics.