Character Design: Villain prop/environment

Here are some more thumbnails and my progress on the final concept art of my villain prop/environment. I really struggled getting the perspective right in this one I drew it out about 10 different times trying to get it the foreground and background elements in the correct perspective, but I'm only posting a few of them. In the end I changed the composition of the image to make it a little easier for myself. The fourth image is the progress of my final concept art its still in the beginning phases, just has the basic light and shadows in it, with none of the carving detail in the tree or the stones yet but I thought I would post up my progress with it.