Chnage color and enhance photos of a website

I have a website developed using joomla , I am looking for photshop and website designer who can suggest ways to enhance the website. I have specific colors,logo ,4 images. The designer need to suggest a better mix of colors for the site, enhance 4 images to looks more professinal, one image on the top of the site also needs re-creating. The bottom line, I need my site to looks better and more profesiona. Designer will supply layout of his design idea and images. No work directly on the site.