Please come to my studio at your earliest convenience. I've muddled up your nose terribly and trying to fix it from memory is only making it worse. Our floo address is [X]
Bellamy Echelon
(the painter)
(from the park in Hogsmeade)
Postscript: If coming to my studio is going to be some big To-Do and you'll have to ask your parents about it or something, I can meet you in the park again just as easily, only we'll have to wait for the weather since Hogsmeade has been drizzling and I haven't sealed the canvas yet and rain would ruin it.
I don't really know how people do these sorts of things in England because I haven't lived here very long. I'd much prefer my studio, but not if you coming there would cause a fuss on your end. (Or maybe that's only young women who have fusses made about visiting people's houses?)
It would only be a big issue if I was a young woman. Women require chaperones otherwise their reputation could be tarnished quite terribly. I would be free tomorrow or on Sunday to come to your studio but I don't want to if that works for you. Once you have fixed the nose, would you be quite done with asking me to pose? I can't imagine you would want to paint more of me for I am really quite ordinary.