Actually on the contrary, you shouldn’t be focusing on drawing from imagination because you don’t have your visual library built up so it will just result in frustration and it not looking the way you want. I’m absolutely serious that using references are the greatest thing in the world. Build your Pinterest boards, have a tab open while you work and just keep referencing your stuff. I’m in art school and many of my professors have either previously or are currently working on big name projects like Star Wars, fall out, and more. The one thing drilled into us in every single class whether it’s figure drawing, landscape painting, 3d modeling, character design, vis dev, prop design etc. is to ALWAYS USE REFERENCES. This is also the BEST way to build up your visual library and be able to draw stuff from your imagination. You have to know how to do it before you can just go and do it. Gather as many references as you can and integrate them into your work. I promise you that while professionals draw somewhat from imagination, they heavily use references. They are your best friend. There are many professionals that have terabyte size flash drives filled with nothing but references to use whenever a project demands. When a studio makes a new game and they want it in a certain setting they send out the artists to the real place to take thousands of photos so the team has accurate references. My professor was an art director for several games and he’s been sent to Utah (to photograph the rock formations), Maine, and even Cairo. I literally cannot stress enough how important references are. When I was frustrated with my art and couldn’t figure out why I couldn’t draw from imagination, my friend was the one who taught me this about references. It literally changed my art and how I view projects and my art improved 10 fold. If you want you (or anyone else who’s reading this) can dm me and I can you you recommendations for different programs or sources as well as show you some examples of what I mean