Thank you for the invitation. Can you confirm me what is the book cover size? There are several sizes of Book Covers.

Thank You
Deep

Thank you so much for asking, and being willing to contribute your creativity.
Dimensions: 8 5/8 x 5 3/4

The picture of the man is not downloadable. How can I get this picture?

That is a shot taken in a magazine. Unknown.
Does this help?
http://www.gettyimages.com/detail/photo/mature-man-wearing-half-suit-and-half-high-res-stock-photography/200434894-001

Hi, I have no authority to download the picture from the link you mentioned. I think you should provide the picture to us.

Hi. i recently submit one design for you. please feel free to ask for any change. if you can please upload your logo. what do you want on the front cover. the man with the fitness side and business side. some icon. your photo?

Please check the brief it is in there

Would you be interested in an illustration in the style of my profile picture of a man, half muscular in workout gear and half in work suit?

Yes, It would be interesting to see how does that look. Spiky hair with fitted suit.