You may request anything you'd like, including a background, pair of characters (1-2) performing whatever action you'd like. This should take a while to complete, especially depending on the complexity of the piece.
Fully Colored Character & Shading+Highlights
You may request whatever you'd like. You will be given a fully colored piece with highlights and shading. This does not include a background however, that being reserved for a higher tier. You may commission an original character or anything of the sort doing anything you'd like (1-2 characters please).
You should receive your commission relatively soon, something like this taking a moderate amount of work depending on the complexity.
Simple Character Line Art/No Color
You may request a piece that would resemble more of a sketch. However the line art would be finished, only missing the colors and highlights that are given in the higher tiers. You may commission 1-2 characters in any situation you like. You should get your request relatively quickly, it only being line art.