Hi @Andrew Wilson, nice job! I think these are pretty good. The anatomy seems accurate for the most part, and the drawings read as three dimensional even without shading. - I would try to design the shapes more carfully. The lines and shapes wobble a bit and take turns that don't add much to the drawings. I would aim for simplicity. By that I don't mean a lack of detail, but an economical use of lines and curves. In the drawing to the right for example, you have a double curve in the sternal portion near the insertion, when a single s-curve for its entire length would have been enough. When drawing on a tablet it can be hard to control the lines. It might help to use a softer brush, that allows you to gradually build up the strokes. - In the drawing to the right, you might be attaching the pecs a bit to high on the humerus. - I think you did a good job using the muscle fiber lines to show the orientation of the muscle. I would take a closer look at the fibers for the sternal portion to get the anatomy even more accurate. The fibers do a similar thing as the whole pectoralis major: the high ones aim down to the bottom edge, similar to how the clavicular portion starts high and inserts low. - The drawing to the left looks really nice, but I think you might have got the twisting wrong. Hope this helps :) Keep up the good work!