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That's pretty nice. Not too much detail, but you were working from a model that didn't have much after all. I think you got a lot looking right except for some of the bricks weaving. On the bottom half of the sphere the horizontal lines appear to curve the wrong way. They should all be going )))))) (curving in the same direction) and toward the bottom you get something like ))))((. Here is a cheap stock photo to explain what I mean. The only other thing that sticks out to me is the inner part of the 'eye' which looks a little diamond shaped.