Checkout this great cover gallery archiving over 150 covers of Vladimir Nabokov’s masterpiece Lolita. A few favorites–
This 1957 Swedish cover is a pretty subtle/creepy upskirt.
A 1964 LP with Pop Art undertones–seems a little too frank.
This 1970 Italian cover seems to be the earliest “girl in socks” theme that pops up again and again in the archive.
This 1972 Norwegian cover picks up the voyeur theme again, but it seems awfully goofy.
The poster for the Stanley Kubrick film adaptation inspired a rash of bad covers, but I think that this 1977 German cover works really well.
A Lebanese edition from 1988. Pretty and simple.
Balthus and Lolita seem like a natural fit, if a bit too obvious. I counted two other covers sporting Balthus paintings in addition to this 1995 English edition.
This Polish cover from 1997 is nine kinds of creepy.