An aged look in the fabric would go well in this room. At the foot of the bed is a chest that can store toys, extra blankets, etc. For these pieces of furniture, I would check out an Unpainted Furniture store and do the distressed painting yourself. On each side of the bed I have placed potted trees. Again, depending on the ages of the children, you may want to leave the trees out of the room.
Some trees are toxic if eaten.
If you want to draw attention away from it, I would paint the door and the door trim to the attic in the same color as the walls. Centered along the attic door wall, I have placed the existing oak sofa table. Underneath the table, you can store toys, books, etc. On the right side of the table is a small lamp with your toile lampshade. Next is one of the green wicker chairs.