Clever edit, I like.

NICE!

I join @Chaosy.

Sneaky, I like it.

This is one of those icon where its useful if your combining with a skin. But still obvious trace/edit, its worth re-sketching or using one of the games or the tv show as reference. its still has the bone structure/shape of the old Arthas portrait and literally just looks like an old Arthas (if he didnt become the liche king of course ).

I like the idea, it is clever edit. Tho I would like to see more contrast on hair. Even if you check references, Herald have more greish tint, you can add it to make icon more readable.

Simple, but might be useful.