Why the long face?

One would imagine that the life-altering promotion from colonel to brigadier general would inspire joy and cheer. According to these photos, that's apparently not the case.

I wonder why as a colonel, Voldemort was all smiles and contact lenses while as general, he's a more demure, bespectacled Voldemort. Either way, I hope he cheers up...it's not like he's ever had to leave his family for the desert en route to 'earning' those stars (in this wartime military). So he's got that going for him.