As an artist you are always being critiqued; by your peers, your fans, you friends, and even yourself. Critiques can often times be energizing. Sometimes they are difficult to hear, though needed for continued growth. Allowing others to view and provided feedback on your work is necessary for growth and success.
In the art world, from a critiquing standpoint, I often find other artists providing their opinion on my art, both solicited and unsolicited. I also notice that many times artists ask other artists, sometimes artists exclusively, to critique their work.
This is a subject that I can be torn on. While I see and value other artists opinions, for the most part, other artists are not always going to be the ones purchasing your art.
As a full time artist that makes a living selling art, I want to get the best cross-section of opinions and not sway too far to one side or another. I have spoken to artists that only want other artists to critique their work and I always find that interesting. While I find artist opinions of my work invaluable and use the critique to grow as an artist, I find I want to hear from non-artists too, so I can have a more commercial or every day view of my art, from those who have or would purchase my art.
I am always open to anyone that wants to talk about my art and provide an opinion, artist or not. In part of my strive to be a well rounded artist that sells, I want to make sure I am critiqued by a wide audience.