Hi,
We usually take pictures for reference and sculpt them in Zbrush for a high realistic poly model and make the model topology in Maya.
We can make a test or show some work done in Zbrush a Record Video of the process to create it.
Visit our profile page and see some jobs https://www.freelancer.com/u/xplow.html
Ask us if you have any question that we will respond as soon as possible.