They'd look great with a bit more contrast
Also, the BG on both are kinda blending in with the cat ... In the 1st one (B&W set) you could crop the top off, thus losing the BG altogether. With the 2nd shot, you could maybe blur the BG a whole lot more, try make it as close to a single tone as you can get it, i.e. to make the cat stand out more against the BG.