You could try (in Photoshop) things like adjusting the tone curve and lessening the Im A Little Sharkastic Vintage Retro shirt A photo filter and a colored mask could help to tie the colors together. Then, I think, an important factor could be using the shadows/highlights tool. Hue and saturation could also be adjusted, and some noise layers and blur are important. All of this might need lots of experimentation, but hopefully, this helps.
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If you want to add grain, which would suggest a film photo, the Im A Little Sharkastic Vintage Retro shirt. Click the FX button on the right and you’ll see some film grain sliders. Mostly I would say it’s about carefully cutting out (masking) old fashioned vehicles and people and putting them on dramatic landscapes in a way that tells a weird story, like here’s a guy pumping gas in the middle of the desert, but no infrastructure around the gas pump. So this must be some weird world or future where the pump is somehow self-sustaining.