Bumps

I know everyone grows at their own pace bump wise but I keep seeing 15 and 16 week bumps that look 19-20 weeks. When you take your bump picture do you try to poke out your stomach some or just stand straight and tall like before you were pregnant? Just curious if that makes a difference in all our sizes. I feel like I still don't have any real visible bump at 17 weeks and I'm 5'6". So crazy.