Modeling is solid But I can see 2 "small" problems Your stuff has topical raw render cg look => all clean sharp and in focus =>> easy fix add atmospheric prospective blur the edges [using depth thickness or handpainted mask ] add something to unify everything like photo filter or noise You have to spend some time learning…
Why not try adding atmosphere to some of your renders? Everything around us in real life has atmosphere, like particles of different things. I feel that's one of the biggest ways to add realism/depth/life to a project and escape the more cg look (unless that is your goal of course!). I feel I should give an example. Take a…