Refresh of Website Design and Visitor Experience

Hi, We are looking for a designer who can refresh our existing website design.
We have the technical skills to redevelop the website and want to keep that side of things in-house but what we need is some additional design input. For that reason, the deliverable would be a series of image files showing how the new design would appear on the screen rather than actual webpages etc. Most of the pages on our site follow the same basic design so we are only looking for 3 actual page layouts.
Our website is based on the Wordpress Divi theme so knowledge of the shape and capabilities of Divi is essential.