Digital artist to design bird icons

As part of the 'Connecting schools to nature' project, the British Ecological Society is looking for a digital artist to create 'badges' for an online learning platform. These will depict different species of British birds, likely just the heads but possibly full body. Attached are examples of badges already created. The style would need to be similar to these. There would be 15-20 species required and each badge would need about 6 variations based on the same design including different segments filled as well as a silhouette or each artwork.