Proverbally yours/ Message and delievery

Here are my final mails shot designs, i tested printing on two different stocks, white and grey, i chose to print on grey because at the time i felt it looked more suiting, and once received by the recipient in the post it would look dirty whereas it most likely would on white.
now overlooking the designs and receiving feedback i believe the mailshot would have look more clean cut and neater on white stock.

Here is the crit feedback i received:

My feedback was useful and constructive, i believe i didn't receive much positive feedback because of the lack of supporting work i showed for the crit to back up my ideas and reasons.