Concept Exercise Device 3D Design Rendering

I'm looking to have a few digital 3D renderings of patent pending product I've developed. It is fitness related and I've got a couple rough draft digital representations to give you a better idea of what I want. Altogether though, the texture, size ratios, final image and user interaction need to be modified/included. I plan to use these images on a product sell sheet. The mechanism of it is very simple and it is a modification of an existing product, but it is still an original idea. As of now, it looks like I'd like 3 images: One image of the product itself in the open, unused phase, another of a user interacting with it and third, a crop of a users lower half in a different workout position. The budget is on the smaller side, but I've got many ideas that I would likely use you in the future for. To show you've read the whole project please begin your bid with your favorite color. Please also provide samples of your work and any references. You will also be required to sign a NDA.