Terence will be happy to take one or both, whichever you prefer. Most likely Terence would have mentioned it in the last day of class or simply posted it where all students could see. There will be postings in other places, likely anywhere one would get art supplies or the local art community in any of the main magical towns and Diagon Alley.

These are more informal classes, usually a fee is involved but Terence adjusts it according to his pupils means. If they don't have much money, he'll simply get them to help out around the studio (setting up canvases, prepping paints etc, that sort of thing). He does it more for the love of art and helping talented artists to get their work out there.