To put it simply, it's art. The first tier is a single-panel stick-figure comic, which will feature 1 or 2 characters and either one word bubble or a caption in quotes beneath it.
Tier 2 is more of a cartoon-style comic, with characters who look more human or more like animals, at your discretion. Tier 2 is the same concept as Tier 1, in which it is your idea illustrated, but there are no more than 2 word bubbles, or a caption. However, the caption can also be included with the word bubbles.
Drawing (w/ or w/o color) is completely separate from the first two. Here, I will need you to send me a picture of a person, place or object you would like drawn or painted. I will then make a nice drawing of them, complete with coloring, at your discretion.