I will:
Negotiate for TF2 items instead of currency (using backpack.tf prices)
Send progress screenshots upon request
Use characters from things that aren't TF2, as long as you or I can find a model.
Use content from the SFM workshop.
Include unusuals upon request.
Make custom backgrounds (may cost extra depending on complexity)
I will not make:
NSFW content (this includes suggestive things).
Anything I deem to be offensive or in poor taste.
Animations (I do not consider myself skilled enough in this yet to charge for it. Possibly in the future).
Posters
Standard size is 1920 x 1080, although I will change dimensions if you ask.
Can add extra effects such as outlining (seen in first example) afterwards, may cost extra depending on detail.
2 keys: max 3 characters, props allowed but may cost extra depending on number (ask).
4+ characters: 20 ref per character
Icons
Standard size is 1080 x 1080, although I will change dimensions if you ask. (must be vaguely square however)
Can add extra effects such as outlining/borders afterwards, may cost extra depending on detail.
1 key: 1 character, 4 max props