Hello :) I'd just like to know what this means more in depth. I've gotten this a few times now but when I save it looks fine :O

I work with Gimp because I'm more comfortable with it but should I perhaps just move my lining into photoshop since my problem always seems to be lineart :O Let me know please :) I'd like to being my fixes as soon as possible but I'm not really sure where to start.. I also get sharp and/or pixelated lineart but could that be because of the save issues? I'm literally lost.

Thank ^^

hmm I don't know much about gimp so try googling the question about saving with higher quality / png / gif / etc? I know in photoshop there's an option to 'save for web/design' specifically if you want it /more/ shiny.