Remove Background, and touch-up of images

[This project has already been awarded, and has been reposted, as requested by freelancer support, due to some error in the earlier post. Please don't bid. ] I have some 50 images currently which are shot by a photographer. I need to get them edited. The correction required is for: 1. Changing background to white. 2. Increasing the sharpness of the picture. 3. Any other correction, which will improve the look of the image, you can suggest.