Lineart and sketches

This is among the cheapest commission types, because there is no coloring involved.  Can be done in traditional media (pen/ink/pencil) or done digitally.

Watercolour

This is also a traditional media commission.  Buying an original watercolour painting is a little more expensive than regular commissions. 

Digital portrait (no lineart, painterly style)

These are by far my favourite and they take the least time to finish.