Ответ:
In the picture in the foreground there IS a man...
THE man is likely to show THE young children his new assistant for hunting.
THERE is a little puppy.
The adult dog IS GENTLY SNIFFING...
In the background of THE painting THERE is a staircase leading to A river.
THE children are dressed in light clothes.
A girl IS stroking...THE (?) small dog. (Если small dog и есть тот самый puppy, а если нет, то A small dog)
In his hands THERE IS a racket.
Most likely the children HAVE returned...
So the meeting with the hunter IS unexpected.
Next to the hunter THERE IS another dog.
Apparently this is a parent of THE small puppy.
On the other side of THE river there is a beautiful forest.
Объяснение: