Casting the characters; Jenny from Undercover

Blake Lively would
make a great Jenny

Since the main characters - Jenny and Alexei - only exist in my mind, it's hard to say what they look like. I mean, I know exactly what they look like up in my head. Accurately explaining or showing is impossible.

After intense Googling, I came up with Blake Lively for Jenny. Jenny in my head has curlier hair, but they look pretty much alike.

What do you think? Good choice?