In what way does my design require significant improvements in aesthetics and attention to detail?

[AirFast]

Hi there! Unfortunately, I received a rejection for my first WordPress theme.
“Unfortunately ‘WordPress’ has higher standards in terms of aesthetics. An approved design in other categories does not guarantee an approval under ThemeForest’s WordPress category. Your design needs significant improvements in terms of aesthetics and attention to details.”

Would you please advise me on how to improve it?

AirFast's profile on ThemeForest

http://themeairfast.ru/themes/coda/