>>2866846If you want to try photobashing I recall that Maciej Kuciara did a long demo showing how to do it, of like some oil rigs in an ocean, and you can find it on youtube. His end result on the demo wasn't that great in my opinion, but he knows his stuff and his client work is mostly very strong.
By the way, notice how uniform these images are in terms of colour. They're basically monochromatic, and that's because it's much easier to get the photos to look like they are a part of the same scene this way.
There's also various tricks you can do to "hide" the method, like choosing base photos that have the same resolution, or putting a subtle film grain filter over things to unify the painted parts better.
If you're curious to see really high level stuff, try looking at some Brad Rigney pieces from the last few years. He's a guy who painted photoreal from his imagination for a long time but has since switched to using photobashing and painting together, and it can be tricky to tell what is what. His images though are definitely time consuming and are illustration, not concept art.