I always thought that one of the reasons why a painter likes especially to have other painters look at his or her work is the shared experience of having pushed paint around.
Sculpture occupies real space like we do... you walk around it and relate to it almost as another person or another object.
I discovered about 150 dots is the minimum number of dots to make a specific recognizable person. You can make something that looks like a head, with fewer dots, but you won't be able to give much information about who it is.
Never let anyone define what you are capable of by using parameters that don't apply to you.
What difference does it make whether you're looking at a photograph or looking at a still life in front of you? You still have to look.