If you're interesting in the craft of the GM as much as solo gaming and its possibilities, then it's well worth your time to check out Trevor Devall's Me, Myself, and Die! channel on YouTube.
In his own words, "Voice actor Trevor Devall plays tabletop RPGs solo-style, fulfilling the roles of both player and GM." And while the Tinkerage has plenty to get on with other than watching other people play, Devall conducts his solo sessions with such tremendous verve and skill, as well as drama and humor, that they make for entertaining viewing for their own sake.
Devall, as it happens, is a talented voice actor, and not everyone will master the accents and tones he uses to build character, but it's worth noting how Devall makes every NPC unique with an accent, a description, a particular attitude or affliction that is simple and memorable.
The same goes for scene description. In his GM role, Devall doesn't layer in unnecessary or additional detail, but skillfully focuses on and repeats the key details that make the location distinct.
The last GM trick to borrow is what I as a writer would call "blocking". Me, Myself, and Die! is often very funny, but Devall alternates humor and drama, even pathos and moments of contemplation. Some sessions and games aim for a particular tone, be it comedic or grim-dark. Good GM-ing reminds us that varying the tone always hightens the contrasts and makes the action more memorable.
I'm not sold on Savage Worlds as a system, and prefer to Play All the Books for solo-inspiration, but Me, Myself, and Die! is a great illustration of what effective GMing can mean for any game session, and I look forward to the next series.