While the comments that sparked the debate were too agressive in delivery (at least to be absorbed in any constructive way), everyone has a right to say whats on their mind, especially when you put up a piece for criticism. That being said i do have the feeling the writer was having a bad day and went too far in the delivery.
While on topic, here’s some properly delivered criticism : From the first time i saw this piece, i liked the proportions and look, but one thing bothered me when i found out it was a TMNT. He’s supposed to be a Teenager, and i think this piece was weakened by forgetting that.
For example, how many teenagers do you see smoking a cigar? And his body proportions, while cool, communicate more “veteran” than teenager. This guy looks like he has war stories from 'Nam. Maybe this can be more of a TMNTs “Where are they now” kinda piece.
Of course it’s a lousy time to make this comment, when it’s basically finished. But to the artist i would suggest to remember the message next time. You had 4 things to communicate, Teenage, Mutant, Ninja, Turtle. I think you did well in other parts but lost Teenage somewhere down the line.