medallion and coin design

We are diesinkers who produce tools for stamping and casting medallions and coins. We require a suitable person to convert the images on high resolution photographs to STL files. The designs for coins should have a relief of no more than 0.3mm. The images would normally be of people's faces, buildings, animals, etc. For example, if I was to produce a medallion featuring the Queen of England, I would supply a suitable photo and expect an stl file that could be imported into our Artcam software to produce the tool to stamp the image on the medallions. Most of our medallions are only 30mm in diameter, so intricate detail is not necessarily required. We anticipate that we will require 2-3 designs per week