I did this for...probably an hour or 1/2, i don't really remember.
About the background...I used layers to make it(in photoshop) and deleted the last background layer which left the background transparent...then I saved it as .png file (you can also save .gif file, it'll definitely leaves the background transparent) and voilaa. I believe you can't do this in MS Paint.
Aww, that's a shame. I only have MS paint. And I meant, like how long have you pixeled. Like, just pixel art in general. A year? Two years? Well, thank you for your advice! I'm really happy that you responded! <3