I do 3D graphics. This was all done on my computer. The girl, the pose, the lights, the background, etc. Nothing you see has a real thing in real life. It takes gobs of time to do, lots of programs, and then conversion from 3D to 2D called rendering that depends on your computer horsepower as to how well it's done and how long it takes to do it so that you can see the image without the software. What makes it so computer resource intensive is that in the process the software calculates light beam bounces and determines the shade or tint a color should be. It is not unusual to see a 10 hour render at high resolutions.
I broke my graphics computer when I fell on it, broke a USB that shorted out and killed the computer. I have just gotten another but have yet to put in a few hard drives, install programs, and get back up to speed with them.
This stuff is like an onion. Easy to start out with but the more you know and the more you want to do the deeper into learning you go as the layers reveal themselves.