What a nice art style! Modern and clean lines but cartoonish and cute at the same time... and such detail, too. Fun to try and imagine the conversation, as well. The guy looks a bit surprised. Maybe she made the tea too strong? Or maybe she just admitted that she gave his lab a makeover while he was out on some errand? She seems to be enjoying his surprise, anyway. XD
Why do you describe them as monsters, though? These characters look like interesting sorts - perhaps both eccentric inventors? - but don't strike me as being monstrous, you know? The style of the window and the furniture puts in mind of the Addams family but really... Even they were remarkably nice people, on the whole. But yes, of course, even monsters should have a nice tea time.