you can absolutely just use refence images for 3d art without drawing. When you are familiar enough to quickly do 3d blockouts on the stuff you want you start to see if that is going to work or not and move on. just like sketching in paper or photoshop. after that is just filling the blockout with details. this i can say from experience, I do 3d concepts for descendent studios for their upcoming game descent underground and my drawing skills are very limited. 🙂
