Graphic designers do a great job with colors, layout, design, etc.  Graphic designers' expertise is not marketing.  The focus of their training is not marketing.  So, be careful company's ten to call their graphic design departments, marketing departments.  Unfortunately, the talented graphic designers are not in a position to provide accurate advice on what design, layout etc, will best generate leads.  Yet, Agents ask and the graphic designers often love to provide advice on marketing.  After all they love their designs.  So it is easy for them get very excited about the anticipated impact of their designs.  But they are never in a position to find out whether their designs work. 
Bottom line, do not ask your graphic designer for marketing advice unless they want to tie their fees into the results you get from it.