Shadow Keeper is at
http://www.mud-master.com/shadowkeeper/
Yes there are three Pitures sizes, with three sufixs S,M,L
The game (in the override folder), likes S and M. While Shadow keeper (in the portrait folder) likes S and L suffixs. Such as "GuyS" or "GuyL". And if its a npc, there is a N as a prefix, thus "NGuyS". Also, you are limited the number of letters it will except in a name, and SK is much picker about portrait size, then the game itself. It must be exactly 60x38 or 170x110.