Please do mention the exact size of the book jacket and the width of the spine.

Dear Karina, please just design the front of the book cover so far, that will give us an idea of the style. We will let you know the exact size in a few days.

I have submitted already, please do check it and give feedback.

Giving more time to designers is really a good idea.
Giving them feedback (good or bad) is also better.

Thank you for the great amount of feedback given. Your messages gave me the possibility to understand what was wrong and what was right in my proposal so i could change it and, most of all, compete in the same way of other designers...
LOL