I would tend to think that muscles with extensive mass(Like roughly easter ham sized forearms) ARE NOT aesthetically pleasing. However, I have found that a lot of women find arms with good definition and vascularity and almost grapefruit biceps will attract some attention.
I'd love to find a way to improve my arms vascularity.
Just do more forearm work. Curls and reverse wrist curls should do it. That combined with dropping body fat., make sure you don't use straps for your pulls and rows.