Looks good, I really like the second ones simplified pelvis. * Consider adding a plane for the sternum to each. * If you are going to do the boxy thing, maybe consider adding the rib cage nested inside with a different color to show you understand the form. Thin references where you can see the rib cage like the second reference will benefit from drawing it. I think you'd struggle to flush out the second drawing with your boxy method. * The body builder facing the camera head on is a bit difficult to read. Consider adding some cross contour lines when shapes are hard to read. * All 3 drawings are very loose, consider doing at least one tighter drawing. For image uploading. Most websites don't understand software specific project files. You need to export/save to a standardized file format that all websites/tools understand. For these kind of sketches, use jpeg or png. You can export a single layer with "File -> Export (Single Layer) -> .jpg" or "Save As" and then change the file format to jpg.