A model of aesthetics that prioritizes higher degrees of visual fidelity and/ or physics simulations in a work.
While realism describes specific works, realisticism describes the mindset that judges or critics may have when viewing them. Contemporarily appears most often in the discussion of video game graphics, juxtaposed against those who advocate for artistic stylization.
The largest critique of realisticism is that its proponents fail to "see the forest for the trees," confusing likeness to reality for immersion; if things necessarily had to be accurate to reality to be appreciated, the fantasy genre as we know it wouldn't exist.
If it wasn't for the average person's wonton realisticism, maybe we'd see cooler designs in video games. Does anyone /really/ need to see their virtual horse crap itself every five minutes?