Would you say the following oil paintings were hand painted, or are they 3d architecture renders with a painting filter applied on top? Is there a possibility that they are done by hand? They're not mine, I'm just curious.

https://riscostudio.com/pintura-al-oleo-1
https://riscostudio.com/monterrey-2030-oleo-1
https://riscostudio.com/fallingwater-oleo-1

You can zoom in on them.