A quick post. The upper right drawing was inspired by a drawing Alan Lee did of a twisted looking mill that he did for LOTR..... I think it was for the burning of the Shire sequence. Anyways, what I liked about it was that the building felt very organic, like a creature crawling along the ground. I think it is important to visualize buildings and architecture less like blocks and rectangles, but rather as organice forms... even if they have straight walls. Rarely do you see a structure that is just a plain box with no other features.