Fake lighting on unlit clouds - Unreal 425 new skybox

Working with the new 425 skybox. Experimenting with unlit materials incorporating fake lighting for clouds that can react to the new sun-model.

Going for a 'Gorgeous View!' or Witcher vibe; thoughts?

Sun is on the other side of the map at dusk. Highlights on the edges of the clouds lit up to match (compare vs 1st pic @ dawn).