I'd say good luck for that, i've been using Ren'py but still not an expert yet and not even one game published yet, and i can't still accept the fact that Ren'py couldn't do what Kiri kiri could, like scrolling backward in a small window like what i usually see in most games i played.
Okay that aside, I do draw but i'm not prepared to draw hentai stuff. I did make a very short one but i sadly i can't show you since my hdd crash, i'd love to help a bit but i could't draw the Ero stuff, i could help drawing the repeated skies or scenery to help reducing the artist's burden though, and i'll do it for free if you want to. Three kind of skies or something like that. The only thing left from my supposed-to-be-Eroge is something you can see in my album called artwork though. Still not good enough but i think i'll get better. I'm glad someone's trying to do their own Eroges,I'd love to see how this turns out. A guilty pleasure, Eroge is.