I think that, for your first swatches, they are pretty good!!
As others have said, you have to practice to get your tension right, but if you keep going, everything will start to look uniform and even. As a side note, it is fairly "normal" for your knit stitches (and thus, the square you did all in knit stitches) to be tighter than your purl stitches. Again, with practice, you will probably find a good, balanced tension between the two.
ETA: I made LOTS of squares when I was learning and, even though they don't end up being anything more than practice, I am SO glad that I did that. It really helped me learn how to identify my stitches and understand the "logic" of knitting.