I was trying to speed up and ease my work with game objects a little bit, so I did most part of the work in Maya with Arnold renderer.
Since the goal was to create not very "cartoony" objects, but with realistic geometry, this was much easier for me to do 3D models first.
This models are not perfect, but it was enough for me to understand to form for overpainting in Photoshop.
Anyway, this was a fun experience.
Every model, except bed and house, took me about 40 min - 1 hour in Maya to create, bed was about 2.5 hours and a house about 4-5 hours.