Even I am the one who made the Poll about the comment VS favorite and most of visitors don't know what should they write and favorite is more easier than leave the comment.
you can check the poll
[link]Well.... I am agree with the result, Some them say they like to favorite than leave some stupid comment as "Cool" or "Great job" and favorite is easier than comment. Of course, you no need to leave the hand form your little mouse.
but in my opinion, just the shot of comment as "Cool" or "Great job" it made the activities for the artist and can check how the visitor think about their art than just favorite. Because Favorites is n't show the power of activities enough for the art work that Artist use more than 1-3 hrs to created. The short message have more weight than click some button.
and the thing that in my head is
"Are they lazy to leave the comment?"OMG, WT...., @&#$^%$&*
That means you not care about picture just ok that good click...and click . Oh! that also good click it.
I think this click traditional is came form Facebook. Because now a day they don't want to reply any message just click LIKE that is more important. But in my point of view that click will destroy the social network because it didn't show the give and take enough. Just show how many I can click per day.
In this case, I think 3hrs and more for my artwork just for one click. The value for it just only one click.
For example my last 4 artwork have just one 1-2 comment per images.
Not fair for the artist at all.
I means for me!!!!

What do you think?
Here is some stamp for comments thank you for all creators who shared these stamp/