That looks pretty nice to be honest.
Not much people can do art on the Paint program.
You must have good skills. :]
HEY!
I do, and i don't think my stuff is half bad! I love paint! It is easy to use, has plenty of options if you know how to use them, and is free (on most computers)
Anyhow, your picures are not too bad. They are a bit anatomically incorrect, but i think that helps define your style!
I would suggest some shading though. Your pics are too flat and 2D'ish. Some shading would give them some more life. I know you said that you decided not to shade, but it's just a suggestion... (i'm not "having a go at you"...)
Anyhow, as for anatomy, the feet! espeon's rear feet are facing backwards, so it looks a bit funny. Cubone's right foot is pointed all the way left, when it should be pointed more out to the right. Bulba's actually look good, and make him all cutesy looking, and the same with ampharos and mew. I'm just deciding whether or not i like umbreon's...
Other anatomy issues are the big heads, and the rear legs being scrawny on some of your pics (like espeon and umbreon, cubone and bulba's). But like i said, it defines your style.
You did a nice job, and it looks like you put some time into these! Don't get discouraged if i sound to harsh, i'm not trying to be... just keep at it!
Keep Spriting!