I see the definite improvement you need to do.
You should choose the appropriate size for the feature images. You are using Jetpack Photon which is affecting the picture quality by resizing. The cause problem is not Photon itself; your images are not in proper size according to theme requirement. You should contact theme developer to ask about it required size.
In the right sidebar, scroller in subscription box is not necessary. You should avoid scroller for it. Why not only use, Jetpack subscription, Mailchimp custom form are also useful.
Ad placement needs serious improvement. According to your theme. One ad unit at above the title and one ad in the middle of the post or the sidebar would be enough. I am saying this so as per content length. I can't suggest using more than two ad units until I don't see increase content length.
Concluding all above things, I would suggest the focus on quality representation. Learn about the formatting of the post, how to make a post reader-friendly, increase readability, learn about these all topics. In short, I can say choose the proper font, colour, etc. Below I am sharing some article which would be helpful for you.
After following above things, your blog will deserve to get approved for re-consideration. And, I firmly believe you can do it well.
All the best!