I'm in a love-hat relationship with pixel-art right now, I did not like my final result but I have NO will to try redoing it. Bat-Penguim everyone!
I'll do that but I have no idea wich colors should I use...
Yeah, it wouldn't be too hard to add that. If you have a magic wand tool you should be able to just select each color and change it to something with more contrast. There's only three after all. Fun idea!
Kinda hard to see, I'd try adding some more contrast to those colors