After creating the bulk of ink thumbnails for our fish character, I took what I felt were the strongest silhouettes and altered them using the fin designs I had also created. After talking to the group, we all agreed that thumbnail 4 had a lot of potential. As such, after discussing what tweaks could be made to improve it, we have ended at something that can now serve as the core reference for our character concept and orthographic.
Set of Refined Thumbnails
Fish Thumbnail with Alterations