Here are some Term of Service:
-I am allowed to decline a commission proposal if I so chose to.
-I've got no problem doing NSFW commissions, but i might be sensible to some kind of themes. Since it might take long to describes those kinds, you can apply any request you want, and then we might discuss if i feel comfortable approaching the theme or not.
-I usually accept payment after the sketch approval.
-First to arrive, first to serve. You can communicate any necessity.
-Try to describe as much as you want from the commission on the question sections. Any addition made during an advanced phase of the commission might cost an extra.