What girls Alex like (appearance,how she look like, her lifestyle and etc.)???

Well, I'm not sure but I think he likes girls like Ingrid and the ones he's touring with :) I mean they look all kinda the same :) Maybe/probably he likes girls who's not looking like them too :)

Then how he wants a girl to be/ act, I haven't no idea about.
But most guys likes girls that are themselves and aren't trying to be anyone else :) atau that's what I have heard/read :)