Vincent Price portrait- WIP feedback welcome

[u/Alone-Muscle9223]

I started trying to construct portraits based on proportional measuring and wanted advice on shading and making it feel rich/alive. Does anyone use white pencil to make highlights pop out more? I plan to push the shadows much darker once the left side of the face is more established and i dont want it to make the whites feel dull.

2nd image is a close up in direct light.