HP Coloring Book

I've made this drawing as an illustration for Tira Nog's wonderful fic "A Nick in Time" ages ago but messed up colouring badly :( This is a precious pic for me, 'cause I asked my nephews to pose for it. I can't understand how people can be so brilliant in colouring while I clearly suck but I would like to see a coloured version if there is anyone who wants to have a go.