@Joey102 When it comes to bodybuilding, more experienced people tend not to get a pump before a competition because it will make it harder to feel exactly what muscles are being activated during their program. Getting a pump also makes it easier for your muscles to shake when posing which is bad.
@Joey102 Taking a static picture and posing live is very different. You're correct when it comes to looking good in front of a camera but I just thought I'd offer the bodybuilding perspective since it's different from how these things normally are.