Thanks for the offer, DarwinianTheory - and welcome to TiBB.
Maximum size for avatars is 150 pixels in width and 160 pixels in height, so anything below that is fine!
There aren't a lot of pics of the housemates available yet, but I'm sure Mark & James will be adding more avatars as the days go on.
In the meantime, especially for Kore, here's a couple to keep you going ....
