Hi, Leanne
$150 is a low reward for 11 unique illustrations

On designers' end Payments looks like this
1st Place - US$150
Participation Payments x4 - US$10
Total -- US$190

Payments for designers are less than your Package Cost because of Posting Fee (US$89), Project Management Fee (20% of your Project Budget if package value is US$200 and more)

Also other upgrades (Private Project, Featured Project, Highlighted Project) are paid and reduce total prize payment

here is some info
https://www.designcrowd.com/help/article/how-much-does-it-cost-to-run-a-contest
https://www.designcrowd.com/fees.aspx#

can you upload a pic that show what you want exactly ! how the design will looks like !