Yes. But never in the galleries. I do it in the forums when someone asks. 

To me a gallery is a place to show what you've done, and not a place for someone to come in and give you suggestions of what they feel you did "wrong" or what they would have done.

Art is a subjective experience unique to each individual and and who am I to say what is or isn't "right" when it comes to making art?  I know what I like to make, I know what looks nice to my eye, and I know what "I would do", but that doesn't make what I do right and what others do wrong....just different.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi