Well, perhaps 3 years ago I saw a wonderful image with beautyful roses and character. All things went well but not the lipstick which has "shot" the whole image. I wrote this and said that it would be better to try or use another lipstick next image. 
The artist (female) has start to kill me after this message....So since I let others do what they want.... 
Most I only comment a view images from artists which I took in my favorites. Others I only comment if I see a work from whom I´m impressed.

Sure, "I don´t like" isn´t a comment that helps. Not all persons like the same style of art, and so not everybody "like" or "dislike" my art by sample. I can give a critique if I recognize a technics probleme, but than I also have to say how to fix it or how to do.

I remember in the beginning with Poser so many told me "There are no shadows", but no one told me how to do a shadow :-// That makes non sense.

But´if you don´t like an image, it´s better to say nothing ;-)