I like the echo of the second cat and the lighting and focus is in general very nice. I with the front cat's face was a little brighter but with basic editing, I guess you can't do anything about that.
Absolutely beautiful cats, lovely colouring. Nice sharpness and bokeh in the shot. The very similar markings/colour of these kitties makes it believeable to me that they are siblings. Lovely shot overall, though the highlights/midtones being bumped a little to brighten the shot a wee bit would have been good.