Realistic Clothing & Face Retouch

I have a few portraits where the trousers and shoes don’t sit naturally in the scene—the edges and outlines give away the edit. I’d like those elements refined so the clothing blends seamlessly with the background and lighting, without any “pasted-on” feel... (Budget: £10 - £20 GBP, Jobs: Digital Art, Illustrator, Image Processing, Photo Editing, Photo Retouching, Photoshop, Photoshop Design, Visual Design)