Webdesign Optimizations for Online Shop

Hello, we already did a screendesign for an ecommerce website intended to sell bike. We like the screendesign as it is. But from the current point we need a skilled design expert to improve the design, add some nice ideas and features. We clearly don't want to make big changes. But we want you to do effective changes that improve the usability and make the design just a little rounder. We have -> Startpage -> Category Overview -> Product Detailpage Please bid with some of your best references. Please only bid if your bid fits into our budget.