Redoing an old picture (Patreon)

Well like I said in a previous journal, I plan to try one of these do-over some artists are doing ^^  

Basically taking a several years old piece and redo it entirely but this time with all the tricks and skills that i learned in the meantime. It can be a really fun and interesting exercise and give a second life to an old piece :) 

I have a couple of potential ideas in mind already but I'd like to know what you guys think a good piece for that would be ( preferably a single illustration )  :3

Also I have been in the mood for drawing some mouth play lately so you can expect a picture like this to come soon as well ;D