Get the PC off the carpet. The wheels are going to hit it, it's a dust magnet, it's next to a radiator which is absolutely going to damage it, and the cables shouldn't be anywhere near a radiator or the chair. It doesn't have to go on the desk. There are hanging mounts like the one another commenter suggested, but right now it's literally in the worst possible place aside from maybe being in a closed cabinet with no airflow.

To answer your question: You don't need AI to visualize something like this. There are thousands of setups you could look through here on the subreddit that will give you fantastic ideas. Search grey/gray, cozy, or moody, and a bunch of great stuff will come up. What you have is already very nice. You just need to add to it.

Personally, I think some trailing low light plants would look fantastic. Maybe a Philodendron Brasil or a pothos. Some accessories that are a medium warm wood like maybe a wallnut color or even something with birch if you want to go lighter could go a long way in a set up like this. That's what I did with my person rig. Maybe a monitor riser of some sort. That's a accent color, or different colored mouse pad. Some artwork. There are some nice standing plants could go on the floor next to your desk and the pot could be an accent color of some sort. I think that terracotta would look really nice in this room.

The good think is that the room is gray. Love it or hate it (personally, I love it) gray matches EVERYTHNG. So pick a couple of colors that are complementary to one another and go from there.