Veins and how they appear depends on the person and their genetics. Some people with have more veiny arms then others and some with working out may see an increase more then others. I don't have veiny arms and even when I was doing a body building routine with great success back before 2002, I still did not see any significant increased veins or puffiness.
Don't get me wrong, I can see the veins on the inside of my arms just fine and giving blood is never a problem as they stick out. Personally I don't see that is attractive, if that is what you are talking about. For body building the veins they want to stick out are as such:
That is not something I have nor do I want.