That third one is mine - did it in my pre-Interent days! I think MKeemer can confirm this - we used to trade by snail mail. Don't really draw anymore, pretty much restrict myself to stories and when I did draw, there was always at least some tracing involved. What a blast to see that one again after all these years!
As for Alf's question as to why the cats seems so fat, these easiest answer is because I don't do foreshortening that well ... but I prefer to think they're fat because of the endless hours they spend each day lapping up milk from - well, you get the idea!