Illustration - Simple Facial Expression

I have a logo for a singing group which within it uses two letter Os as faces. The intention is that these have simple faces which are singing in an aspirational and inspired way. However, I can't quite get it right and my attempts just come off as appearing sleepy and disinterested...(!) An example is attached.

So, we're looking for that single "aspirational and inspired" expression please, in a minimal vector style – literally just a few lines. The expression can be mirrored in the second "O", or perhaps flipped and altered slightly.

UK bidders preferred. Cheers!