Rough human skull model

my first attempt at sculpting something organic in blender, i set a fixed time limit of 12 hours to finish the model, and this is how far i went in those 12 hours. i tried to be as anatomically correct as i could, but of course there will be many mistakes as it is a hollow model, so no sella turcica, no sutures, no foramen magnus, and no sinuses. i'll probably continue working on this model to make it as anatomically correct as possible. anyway, i hope you like it. if anyone wants the blender file, let me know and i'll upload it. edit: .blend, .SAT, .STP files uploaded, the sat and step files are very badly done, if anyone can coonvert the stl better, please send it to me, i'll appreciate it!! :)