I'm a very visual person, so I strongly embrace art.
I have a rather full folder of cool fantasy people art. Years ago I picked a bunch of them and printed them out 9 to a page and cut them up. I keep an envelope of them with my DMing supplies, and when I need to improv an NPC I pull out a small handful and quickly pick one that looks like it can play the roll. Since it's not a "perfect" fit, it often suggests otehr aspects and makes the NPCs more memorable and original.
I'm currently running two games. One online and one in-person among extended family that were in our pandemic group. For both of them I do a lot of pictures. But something I found - I have now three fantasy people art folders. One general, which is where I go looking for characters to play and such, but I also have smaller ones for each of those campaigns because they each have developed their own art style.
One of them goes realistic and serious. The other is more stylized and allows more whimsical art. Mind you realistic doesn't bar fantastical, just requires it to look like real fantastical. I have a subfolder for when they were in the feywild (well, faewild in that setting) and I have lots of completely fantastical pictures, but are done in photorealistic styles. (Or are photos, lots and lots of talented people out there doing costuming, makeup, contacts and prosthetics like ears or wings.)