Requesting someone to try cleaning up the lineart and make it solid, with a transparent background. If you could, try also fixing some of the anatomy. There's a lot of issues with it (and I'd have to specify, so don't bother with much), but atleast try fixing their hands and mouths (the latter seem kind of wobbly and poorly placed.)
Characters are Matsurika Shinoji (left) and Shidou Maria (right), both from Maria Holic. Character references:
https://files.catbox.moe/hg7dt7.pngAnd if it at all helps here's the original sketch pre-Waifu2x:
https://i.lensdump.com/i/jV8Sl5.jpg 