[Cthulhu_]

They could start with stick figures and placeholder graphics to communicate the idea, then level up; a great example of this iterative approach is Factorio, which redid some of its graphics and graphics pipelines over the years, starting off with basically MS Paint style graphics, then moving to a detailed 3D model transformed to 2D sprites pipeline.

Then there's the Kingdom of Loathing games that never moved on from shitty Paint drawings, lol.