Regular graphic design work for website

Information for the business: We're an online bike store
Industry: Sports and Fitness
Design details: We need website banners and promo units creating for use on our website. These will often use existing product images or graphics as a basis combined with our own branding and style. We have done all graphics in house before but now want to outsource this as we're not graphic designers!

For this first job we would like the following banners creating based on a single brand that we sell. They can share elements between them and should be cohesive.

1800 x 440px website main slider
233 x 158px website lower graphic
640 x 640px mobile website main slider
318 x 320px mobile website lower graphic

If the first designs are impressive we would then look to engage you on a regular basis as we need new graphics such as these on a weekly basis.

You will need to have examples of quality work in your portfolio or attached to your proposal for us to be able to consider you.
Target audience: Cyclists
Ideas for the visual style: Modern, sharp, fun
Urls to draw inspiration from: http://www.santacruzbicycles.com/en/uk, http://www.probikekit.co.uk/, http://www.yeticycles.com/
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