There are a lot of cool tools on ClipDrop (image upscaler, remove background and replace background to name a few), but Relight takes the cake! You can add new lights to alter the color of a “studio: type environment.

iPhone iPad Clipdrop is an app suite allowing you to easily modify your images with AI. - Incredibly accurate Background Removal - Remove objects, text, defects, or people from pictures - Relight your photos & drawings in seconds - Teleport anything, anywhere with AI - Generate images from text - Create multiple variations from a single image

To better match Face Guy with the environment, I used the Relight feature on the http://stability.ai website to rework shading. Especially good for faking global.