There is now an option at gallery upload which gives you the choice of asking for critical comments, all types of comments, or nice-and-fluffy only. This option is there with the intention of guiding viewers into leaving crits where they will be appreciated.

Personally I went back through my gallery and changed it all to "critical comments preferred."

You can see just above the comments field what the artist has selected so you can let this guide you.

A note on the TOS: considering we now have this guide, we are far LESS minded to remove harsh crits if someone cries about them, unless they selected the fluffy bunnies option. There is a big difference between constructive critique and personal attacks: "I'm not sure about the lighting - maybe less pink would give this a better feel" is fine, but "omg this rilly sucks you looser" is definitely going to get removed ;-)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire