28 deviants said Only if I have something REALLY useful to say, and I am confident that I genuinely know what I'm talking about.
6 deviants said Other? Do elaborate...
4 deviants said Occasionally, if I have something really useful to say, but I generally can't be bothered.
2 deviants said Only if someone specifically asks for it.
2 deviants said Most of the time...because I don't think a comment is worthwhile unless I give constructive critique.
1 deviant said Only if the artist has loads of people saying great things about their work and I think they need to hear something negative to stop them getting full of themselves.
1 deviant said No, cause I'm scared of offending people.
1 deviant said Yes, all the time, even if I'm not always sure what I'm talking about - anyone who can't take it is just full of themselves.