Re: Vascularity~
Unless you're willing to take drugs...your only option is to lower body fat percentage.
Some people are just more veiny then others.
The look you're talking about is one of professional body builders. These guys are usually on a certain routine and supplements to make them competition ready. They dont stay that way all the time.
Another thing you have to consider is again the location of your veins...they simply might not show if they're hidden.
Decrease body fat...that will automatically increase vascularity.