That is Seal: his name is even WRITTEN in the lower-left part of the poster, under the picture proper, and it is well readable in the link that YV posted:

http://www.ovationtribute.com/Ovation%20Promo/A_Round_Windsor_1_Page_US_Ad.html

Here he is, minus the hair...

www.nndb.com/people/486/000047345/

HTH