Prometheus-Work in progress Picture

This is the "giant vs. person" drawing I've been working on for a while. Spent way too long designing his head. Any advice/critique/comments are greatly appreciated!

Completed work here: [link]
World9 - Chibis
Chrono Fusion: Atropos 01
Prometheus-Work in progress
Chrono Fusion:  Clotho 02
Young Prometheus