What is the Surname of Barbie Doll?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Do You See It?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

What has to be broken before you can use it?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?