My players indeed were tickled when I put on one of my wife's robes and a kerchief over my head when I played Madam Eva in our Curse of Strahd campaigns.
I find that strong DMs are willing to wear a blanket over their head and pretend to be an old woman if the situation demands.
What I personally consider a good DM skill, is good spot light management.
Enthusiasm. Nothing makes or breaks a game like a GM who is really into (or not enthused about) their game. Enthusiasm - and its lack - is catching.
They listen to their players and make adjustments.
A common feature of great DMs is... Not banning certain race/class/feats just because they are OP (in the DM's opinion). ...snip...
I've been lucky enough to have played with DMs who allow almost everything. Can't imagine what it is like to be in those DMs who ban every thing that the forums commonly deem as OP.
Looking at some of the posters here, they would say things like, 'Feats are banned in their games because they are broken!' Or 'Paladins are nerfed in my games because they are too powerful!' Sometimes I wonder, are they school teachers or DMs? Or just have poor understanding of rules that they can't overcome such minor issues with their vast DM powers?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.