Realistic Face Edit

I have tried to use AI to create a photo of my colleague and I together, and have ended up with the photo attached. My face (on the right), is a good likeness, but my colleagues on the left is a poor likeness... (Budget: £10 - £20 GBP, Jobs: Adobe Lightroom, AI Content Editing, AI Image Editing, GIMP, Image Analysis, Image Processing, Image Recognition, Photo Editing, Photoshop, Photoshop Design)