Thank you for sharing. However, here is my $0.02. Please don't take these as offensive, just trying to help.
Cat - It was already stated that he should be at a different angle, and have a "cuter" expression. Having pets myself, I know that this is not always easy, however. Also, it has not been mentioned that it doesn't appear to be totally in focus. Maybe it's just my screen, but it does not look as sharp as it should, or maybe not even in focus.
Portrait - Good attempt here. It appears to be somewhat in focus, but the cropping is way too extreme for my taste. I second the "zoom out" approach that was mentioned in the response previous to mine. I'm never a fan of a portrait with parts of the head cut off (in your case, the top and bottom).. with a few exceptions. I have some extremely nice portraits with this done, but 99% of them are not pleasing to my eyes. Also, make sure the eyes are always in focus! Other than that, this was a pretty decent start!!
Last picture - I couldn't even title this one. Hate to be blunt, but it does nothing for me. It's WAY too busy. It looks like it was taken out of a window of a house, looking down over power lines, trees, cars, etc. Sometimes, an extremely simple picture is the best one! In your case - nobody is even going to know where to move their eyes to. There's too much going on. However, if there is a story behind it.. it would be useful to know
Just a few of my opinions; take them as you would like....
Ryan