That is really all that matters then I like it too. Its nice and sharp. I'm sure you will get some others to talk the technical aspects.but I really like this one of my boys
I agree with Hans. First you must like it. There is great colour and contrast here and nice and sharp. I wold like to have seen the top of the taller boys head but what a great memory to have.
Welcome to the CiC forums from me.
Speaking purely compositionally; I think it might have been more pleasing with the younger lad just in front of your older son, almost matching (with their height differences), the angle of the ground to wall join with the angle of an imaginary line drawn between their faces.