Hello. My name is Bori. I am an html developer and I have experience with Mailchimp and newsletters.
1) My suggestion would be to move footer logos to the left too, as they are not centered. And then move the black icons.
2) As for responsive, I can make your template responsive for all OS (when viewed in browser), but when it comes to email clients, please keep in mind, that not all email clients support responsive media queries.
I am available if you have questions and thanks for your consideration,
Bori