Overwall, very nice skulls, it's a hard practice and it's not always easy. I think you did a great work around this skull and the positions you put it in. The error you have the tendancy to repeat is the length of the jawline. Most of the time you draw it a bit to short and so this is one of the main issue that give your skull this type of squashy face. It's not a big deal since you can always come back afterward in order to correct it. I would suggest you to mostly workout simple shapes and forms before heading for the big gun as some of your drawing are still lacking a bit depth and volume (mostly due to rearanging some of the features the right way). Regarding the third rule, I was guessing it was mostly where to put the face features (nose, mouth and eyes). I think by fixing thoses simple shapes and giving extra care to them before heading to details will gives you more insight in how to create more accurate and beliveable features. Great work and I'm eager to see more of your drawing ! Feel free to reach out. | Artwod Feedback