No. When Mila is given the option to turn or drain her victim, that's the game's way of asking if you want to see the turning scene or not. I think it would be tedious if there was a scene for every single mob enemy defeated. Ultimately, I don't think the artwork would change very much either way.
However, if it is a story based scene where Mila would always drain the victim into a ghoul, then there would be a scene shown