Very nice. I especially like the picture on the right.
I have some tips for you here:
Saving in jpg impairs the image quality. Save as a .png file instead, the picture will look a lot better.
Use gentler colors. That bright pink/red combination is a little extreme for your eyes.
Try another software. Paint is good for starters, but limited. I suggest PhotoFiltre. You can download it on the internet. It's 100%ly free, very simple to use and has lots of different options!
You might also try Gimp. It is free and is similar to PhotoShop.