Hello. Can you explain where the $500 USD comes in? I see a top prize of $150 USD. Thanks.

Hi, thanks for the invitation.
I have some information to ask you:
1. THE CONTEST is $500 USD ?of $150 USD
2: I have little time to make your drawing, you invited me now!!
could you be clear about the contest prices??? and if you want to extend the contest?? Thank you