The weight of Commission vs Creative is off-- Creative should be hierarchically more important/stronger.
#18 looks good -- I like the whimsical nature, but the idea of people/marketplace is missing that I'd like to somehow be conveyed. That's why I like #30 -- it looks like 'puzzle' pieces, because what we're doing is creating a market place that matches artists with commissioners (people who hire artists to do custom work). If there's any idea you have with the puzzle piece/C shape/, I think it could be great.