I am cautious of giving heavy criticism openly, so I've done the sitemail thing ( and I'm not a mod), it does depend a little on the attitude of the poster. If the poster clearly asks for critique then I will do my best to be as constructive as possible.

Must also be said that most of the other forums I visit have a different area for those actively seeking critique.

I'll also say that any of my images are open for critique, IMHO it's one of the ways for me to get better.....

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.