First off, CONGRATS ON 30 LBS!!
Compare those pictures to older pictures first
You should see a difference.
Also don't sweat it. One day you will wake up and people will suddenly see the difference and then they will not leave you alone. You will pine for the days when people barely noticed your losses!
This happened to me quite a bit. I lost 40lbs and I remember people would ask "Oh hey, you've lost weight, right?" and when I mentioned it was 40lbs they would act surprised. The day I hit 50lbs lost, it was like suddenly I lost it in the right places and PEOPLE WOULD NOT STOP. Even my friends who had been pretty silent about it didn't stop talking about me losing weight. I've lost quite a fair amount of inches since then (even though it was only seven pounds ago) and every day people notice the changes! It's amazing how much of a difference just 10 pounds makes.
Trust me, people will notice soon and before you know it, you'll be fielding questions left and right from people who want to know your secret