Image 2 Image with Stable Diffusion using your screenshots

This tutorial is using Auto1111 repo but others should be similar.

This is capable of completely transforming your screenshots from that 3d look to photo realism; you can also make it stylized. I will be using my Fallout 4 screenshots as some examples but you could also use it on some 3d renders of characters or drawn art. Use appropriate models for your desired style.

For my settings I use 60 steps, DPM++ Sampling, a resolution of 1920x1080 but you keep it to the aspect ratio of your initial image and a de-noising strength of 0.32 to 0.44. Different Samplers need lower or higher de-noising strengths. For making the prompt I start with deepboru tagger and adjust as needed.

Use appropriate negative embeddings/tags to fix bad iris or other issues. I hope this helps you make some cool images, thanks for reading.