Hey! In the same way the rib cage is simplified, try doing the same with the pelvis—both can be simplified into a simple box. What you need to keep in mind is that we’ll usually see the top plane of the pelvic box, mainly because of the natural tilt of the torso (in neutral poses) and because of the viewing angle of the figure. In most cases, we’ll be looking slightly down at the figure, which is why the top plane tends to be visible. Of course, we’ll see the bottom plane if the figure is viewed from a lower angle. Something that might help is to start by drawing flat shapes instead of thinking about volumes. Thinking in flat shapes helps you solve the orientation and relationship between the rib cage and the pelvis, and once that’s clear, it becomes much easier to add volume afterward. Now, regarding landmarks to identify the pelvis in poses: keep in mind that the obliques rest on the pelvis, specifically on the iliac crest. In men, the obliques are often visible enough to help indicate this area. In women, it’s sometimes even easier because the front pelvic bones are more noticeable, which can serve as a helpful reference when drawing the pelvis. I’d recommend taking the Intro to Figure Drawing roadmap from Artwod, since they teach how to simplify the body using this kind of approach. Another good option is watching videos from Proko, where he explains in more depth how to draw and simplify the pelvis. Hope this helps!
