Painting my children's room

It's been 7 years since we last painted the house. As the wall is really getting "blacker" we decided it's time to repaint and give our house a new look before the year ends. We hired a painter and he charges us $550 for a 4-room NG flat and $120 for 5 doors. Which I think is still quite reasonable.

I thought of doing something special for the children. I requested the painted to paint the children's room in 2 colours, blue & green. After they've done that I drew and painted clouds, a sun, ferris wheel, circus tent and hot-air balloons on the wall. My children was really thrilled when they see the pictures on the wall.