Polish Conceptual Graphic Design

I put together a rough, conceptual graphic in PowerPoint and it needs a professional touch. The end product will still serve as a single image, but I want it redrawn in a clean, modern, pen-and-ink style that looks purpose-built rather than home-made... (Budget: $250 - $750 USD, Jobs: Adobe Illustrator, Adobe Photoshop, Digital Art, Graphic Design, Illustration, Illustrator, Photoshop, Print Design, Vector Design, Visual Design)