Thanks, Jim and Psmith for the input. No worries about being too critical. I asked for it and constructive criticism is what I need!

I'm glad changing the background isn't the issue it is in nature photographs. I agree with the square crop and actually considered it but figured I'd see how the partial body would go over. I also agree about the flash. At the moment, all I've got is the on-camera flash and, believe it or not, Itchy was sitting just under the window in the best natural light I get in my apartment, which is obviously not much. I will invest in an umbrella/strobe combo once I learn more about this (and about the equipment itself). I'll continue with my cats to determine which poses, expressions, etc., work best. I'm sure you'll be seeing more of them. :-)

Thanks again for the input!