What Certain steps should I take to achieve quality standard of my rejected project

After submitting a .Net project basic architecture I have got rejection mail.
That is saying in Header “Thank you for your submission. We have completed our review of “Asp .Net Mvc5 … Basic Template” and unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again.

And also saying in the bottom of the mail “We hope to see a new submission from you soon!”
They also resend me one of my submitted image which is a small image. Actually I save the image as the he Thumb Nail image of the project , And can find that it’s view is not clear!
My question is that, is it only the problematic part of the code submission or Should I also need to make other changes in my project or submission.