I think the main location is painted already. The Building and maybe the first room you can enter. Just like other locations like the Bank before it was really a useful location. Over time the building get more rooms.Yeah, but I don't think he created any art for the inside until now? Especially when it comes to the museum, I'd expect him to wait, as he'd probably have to know what they want to do there in terms of dating, before he'll draw the location.
I really hope it is planned for the dating system. Maybe he plans even a history teacher. There even a not used Computer room teacher. All DC need are few more locations at school, maybe few more school girls.
I think the DC can easily make new stuff for the next 10 years and the game could be still interesting.