Since I've not done this before and it looks like a good-fun time waster, and who doesn't enjoy looking at art?
Detective-san: I really enjoy the show of expressions (the color (and the angle to a lesser degree) changes help to keep the flow from being repetitive and give it a lot of life) and it compliments the avatar you have perfectly. The fact that its a simple colorless with a simple smile is a perfect foil to the more expressive emotions and the richer colors that come with them. (Though that's probably just me looking a little too deeply into things.)
I give the whole set a 9.5/10, can't give a ten on my first go and it could be longer.