I'd say my most accurate impression is Lou Reed, who talks as much as he sings but whatever, I can pretty much sound exactly like him. My familiarity with Beatles tunes means I can imitate all of them pretty well, especially John- folks have told me my singing voice (which is naturally considerably higher than my speaking voice) sounds like John. Also the Everly Bros, who have a similar approach.
Have also heard that my singing and songwriting recalls Robyn Hitchcock.
Can also do a decent croon when covering Roy Orbison and folks like that. Sent Ken and Joe H. my version of Chris Isaak's "Wicked Game"- am able to do both the croon and falsetto pretty well on that one.
Not a singer but the voice I can actually do the best by far is Gollum from LOTR. Not a huge fan of those movies but love the voice/character and discovered I could do an eerily accurate impression so it's my go-to party trick. Basically the same voice as Stitch from "Lilo & Stitch", just raspier and more menacing