I think those who tag their images as "positive only" are doing exactly the right thing. They are being honest! And if you critique their images, you are being rude.

ETA: Looking at the gallery settings, you're only permitted to tag an image as "non-critical commentary PREFERRED". So: you're not a troll if you offer a criticism, as apparently Rendo does not give people the option to say that criticism is completely unacceptable. But you are going against the stated wishes of the person who posted the image. They really don't want criticism. So, yeah, it's still kinda rude to give it to them.

The ones I take issue with are those who tag their images "both critical and non-critical comments welcome" but who still get mad when you offer a critique. Or if they don't respond, their followers start harrassing you. It poisons the entire community and makes it basically worthless as a place to learn because everyone is afraid to offer a reasonable criticism, even on postings that are tagged to accept them.

I like to look at the images by my favorite artists here, but I see no point in participating in the gallery, except when I want to link an image to a forum post.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.