Crop, resize and simple retouch phone / tablet images

Hi, I am looking for someone to help me with a simple, but a bit time consuming graphical project; I need to crop and resize the photos of some ~450 smartphones and tablets (400 phones, 50 tablets). Every product has about 2-4 images so we are talking about ~1300 photos in total. It would be great if you could quickly increase their contrast and/or add fade correction so that they look better. A dozen have a ugly, unrealistic shadow that needs to be cut away. Each photo will need to have a watermark which will consist of a logo that I will send later on. The logo should cover a part of the phone/tablet and not be too disturbing. I will send all the photos. Most are 3-5MP (jpg), but they need to be cropped and resized to the correct size: 737x800 with minimal borders at top/bottom. I need the photos as jpg files so they need to be resized in an optimal way to minimize loss of details (bicubic?). Please note, if it would be just a quick resizing & cropping then I could do it myself, but I want this to be done properly, once and for all. The project should take too many hours and I am a one person company so please do not bid too high for this project.. More graphical work will be available when this project is finished. Kind regards, Filip :) Ps. Check out the examples in attachment (without watermark)