Pricing for a small town henna booth?

This summer I will be running my first henna booth for a festival in town. I found out today that I will have one competing henna booth. I need to figure out the pricing that is competive and yet lucrative. I need price ideas and help with my photos. is there anyone will to share theirs or able to find an online one for me? or even a page with a variety of henna designs with fair prices. thank a bunches!!! wish me luck:)