I think Anna Pogorilaya has one of the worst ones of the top ladies. Whereas Adelina's illusion seems to start at the top of her head with her free leg following the motion, Anna's illusion is completely driven by her kicking her free leg: https://www.youtube.com/watch?v=2cWVnXsR7x0#t=125 The leg is bent and wild looking...it's just not a pretty move for her.
I'm trying to think of some other nice illusions. I see a number of nice illusions in footwork but not that many great ones in the spins nowadays.
Some illusion spins look more like a failed camel than an actual illusion, so Im not shocked to hear that illusions were failed camels originally. Although I like her, I think Edmunds has an awkward illusion, she doesn't dip her head down or get her free leg extended into the air high enough. I like illusions in combination to other spins, I don't like them in step sequences where some skaters have been putting them
I agree with lilahozi - Most skaters perform the illusion spin rather poorly. As a former baton twirler, I was pleased to see a common baton twirling move (toss illusion, toss double illusion, etc.) on ice, but mortified by the poor technique I saw from (the vast majority of the) top-tier skaters. Skaters could definitely take some tips from baton twirlers when it comes to illusion technique!
I like Sotnikova's illusion and she executes it very well ... would prefer a bit more of a split but it's still clean -- a lot of illusions look sloppy, like Osmond's and Kostner's, but it's an incredibly hard spin to execute properly, since your core is constantly shifting up and down, rather than a static core position (like most spin positions) where you don't bob your centre of gravity up and down.
Many do them to get points but they look just plain ugly.
The only one who has a good one is Sotnikova, she executes it very well.
There are SO many possible positions, I don't get why say Pogorilaya chooses THIS position when it clearly does no good for her :/