@James Mayr I'd say the main thing here is to keep the clavicle more "gestural" and wholesome. I think breaking the clavicle into small boxes might be making its design unnecessarily more complex and not necessarily clearer or more accurate. You can mentally picture these small boxes if you need to understand the planes more clearly, but, as an actual drawing/design solution, maybe try to make the clavicle a more unified structure (here's a couple of images with different solutions as examples). Remember the "Cupid's bow" shape and see if you can go with it instead. Also, the clavicle has clear front, top and side planes, yes, but it's also a quite rounded bone, so you could try finding some balance between boxes and cylindrical forms when you design it. Hope this helps.