I finally managed to find a site that can change pictures to specific pixel measurements: fixpicture.org. With that wonderfully simplistic site, I was able to get my avatar down to 100x100 pixels which is FA's required size for icons. Now I can finally feel a bit more comfortable about how my Furaffinity looks.

I realize this journal is almost pointless, seeing as I have 0 watchers and it's not a big change at all, but I'll take small victories whenever I can get them dammit!