Baby's Room- Painted Walls

My daughter, Holly is having a baby girl in March and loves one of the Pottery Barn's room designs.  My youngest daughter, Kerri, is an artist and drew the trees on the Baby's room walls.  I am helping with the painting, but this is how far we are.  We started with cream walls, painted them sky blue.  Kerri penciled on the trees.  We have the trunks painted and are working on the green part.  She needs to make a stencil for the white leaves that will go on the green circles.