Product Design Refinement Expert

I have an existing concept that is ready to move from rough visuals into polished, production-ready product design. I am looking for a designer who can refine the current concept, tighten the proportions,... (Budget: $30 - $250 USD, Jobs: Advertisement Design, Brochure Design, Graphic Design, Home Design, Icon Design, Invitation Design, Logo Design, Poster Design, Product Design, Product Photography)