All of these designs are modelled in realistic proportions and cast in copper, then plated in 18k yellow gold, with varying degrees of distress. Also in raw copper and silver.
Anatomic heart (coronal section with all 4 chambers visible from behind and their corresponding vessels), about 20mm
Swallows, taken from Sailor Jerry flash and brought into 3d, about 45mm from tail to beak.
Octopus
Heart Skull
The Praying Hands Logo of Phil Colvin, Memorial Tattoo