1. Portrait 10$-20$ (USD)
Neck or shoulders up(portrait style), a detailed, full color painting in digital or traditional media.
Can be from a photograph of a real person, or it can be a character, original or fan art.
2. Character Sketch 10$-20$ (USD)
Full body of a character, original or fan art doing a simple pose.
Sketch or line-art, maybe with basic color.
3. Design 10$-30$ (USD)
This is more open ended.