Basically whatever you need done, a halfway decent photo editor can achieve it if they know their way around the latest version Photoshop. Unwanted subjects can be removed, colour and lighting imbalances can be rectified – heck, you could take that stock photo of your CEO and turn them into some sort of lizard person for your next PowerPoint presentation (it's your funeral). The only limits here are your imagination and the skill of the photo editing freelancer you choose. That said, Photoshop has been around for decades and there are a ton of talented people out there who know how to wield the power of it fully.
Why Should You Use A Freelance photo editing expert?
Honestly, it all depends on how bad the image issue are. An entry-level Photoshop user can solve a bunch of problems with a few hours of experimentation and head scratching. That being said, you'd be surprised by how many times a novice person has tweaked an image “perfectly” only to find it the subject of ridicule from somebody looking at their work with fresh eyes (in fact, the Internet is littered with galleries upon galleries of what we call Photoshop abominations). Trust us, that's not the sort of attention you want for your business venture. Leave it to the experts.