A girl is swinging, rather high, on a swing with blue ropes with lots of trees in the background.
A girl is swinging, rather high, on a swing with blue ropes.
The girl is swinging, rather high, on a swing with the same color ropes implies that the girl is the same girl in both sentences.
A GIRL CAN SWING HIGHER IRRESPECTIVE OF LOT OF TREES IN THE BACKGROUND
A girl is swinging, rather high, on a swing with blue ropes as it is mentioned in both sentences.