I found 9 without breaking a sweat:
1) umbrella middle section yellow vs purple
2) Doggie is running opposite direction
3) Puddle under girl holding cup left side vs no puddle right side
4) Kid in bucket left side eyes open vs closed on right side
5) Girl holding bucket has different hairline left side vs right side
6) Girl holding umbrella has 4 hair ties on left side vs 3 on right side
7) Girl holding bucket has white stripe on dress left side vs none right side
8) Yellow umbrella handle laying on ground left is visible vs not visible on right
9) Brown blotch by girls foot holding umbrella left side vs none right side
There’s probably 1 more just because 10 would a nice round number!