The boy in this picture is wearing a red, baggy t-shirt with a long sleeved, green top underneath and loose navy blue denim trousers with white sports trainers.  He has dark brown shiny silky hair and big bright sparkly eyes like twinkling stars.

I think the boy is jumping with joy because he is excited and he also looks extremely happy with his huge beaming wide smile, maybe he has just found out he has made the school football team, or received a new toy, or got that special pet that he always wanted, like a rabbit, cat or dog.