High-Quality Photo Editing Needed

I have a batch of 11–50 images that need professional touch-ups while keeping every pixel of detail intact. The final files must look natural, retain their original resolution, and show no signs of compression, banding, or over-processing... (Budget: £20 - £250 GBP, Jobs: Adobe Lightroom, Graphic Design, Image Consultation, Image Processing, Photo Editing, Photo Retouching, Photoshop, Photoshop Design)