First off, thanks for the reply. I'm a true beginner when it comes to game dev too. I'm open for cooperation, but I don't know if your style corresponds to what I think I'd be going for. You see the style of Yuu Kamiya (NGNL, E.A.r.T.h, Itsuka Tenma no Kuro Usagi), or that of the character artstyle in the ef : a tale of memories / melodies? I'm more into the moe artstyle, is what I wish to convey. I do find your work stunning for what it's going for, nonetheless!
As for image manipulations in Ren'Py, I have to say the GUI and the loading of sprites before text boxes are things I know for sure I'll struggle with. If it comes to that, may I contact you?