Photo Enhancement for Book Illustrations

I'm writing a book on creating water-powered machine models for adults and children. I need help improving about 30 photos of the models for book illustrations. Requirements: - Background removal - Sharpening details The final images should be realistic and suitable for book illustrations... (Budget: $250 - $750 USD, Jobs: Adobe Photoshop, Background Removal, Illustration, Illustrator, Image Processing, Photo Editing, Photo Retouching, Photoshop)