Here is a clear visual guide of the different commission sizes and types of shading. This guide only applies to my commissions, do not use it as reference for other artist. Please refer to this page if you are confused about the artistic terminology used, or ask.
Weighted sketchy liner will be rough campared to normal liner. Bust are only for art trades and some commission options (ask).
Lights out is just a dark layer with lowered opactiy to put empathis on a characters glowling feattures. This is only for flat commissions.