There exist two publications of the proto-Elamite seals (Legrain 1921 and Amiet 1972), but no complete electronic catalog. A 2008 dissertation by K.J. Roach "The Elamite Cylinder Seal Corpus, c. 3500-1000 B.C." includes all proto-Elamite seals and sealings known to that author.
The scenery of proto-Elamite seals is restricted to a very few categories:
Geometric
Animals
Animals acting like humans
Mythical animals
Note the paucity of depictions of humans.