Both of those pictures are fine examples. The first one works well with the road and tree lines leading your eyes into the picture, the inclusion of the child pushing his bike adds that extra element that gives it a much needed focal point. The second is a great shot and this time you have managed to keep the whole image interesting, some texture of the sides of the building, the lines of the beams once again lead your eyes into the centre of the frame where we again find a great silhouette of the two children. Both great shots.
