Good Sprite Editor for Windows

[schnoot]

I know this question has probably been asked plenty of times and has a thread about it somewhere, but forgive me. I'm new here (and also a little dumb, lol).

 

I've been trying to edit a few sprites to my liking, like giving Doomguy gloves and changing a few weapons. I know many mods are out there for what I want exactly how I want it (i've found a few), but I like the challenge. It's a good way to learn, imo. I've tried using paint.net and it's okay, I guess. Just wondering if there are any more out there. Also, a little bonus question: any good ones for an iPhone? I do a lot of my digital art and SketchBook works fine for that, but not for pixel art. Right now I just use Pixel Studio, and it works pretty well. Just wondering if there are any others out there, cause it took long enough to find what I've found so far.