yes. the brain looks very unrealistic but you really did a good job on the bolts.
i'd suggest looking at a picture of a brain. if you look at a brain closely, you can see that the brain is made in two halves. looking like to halves of ovals with their flat sides down.
but the wrinkles are good. but i'd suggest you make more of them. when you look at a brain more closely, you see it is made out of many tubes. not just a blob with wrinkles.
work on this. it has quite a good concept but the execution needs just that little more work. 2/5