Помогите написать поведать на британскому по этой картинке, даю много баллов.

Это только вариант вероятного описания, можно написать и больше либо уменьшить, если захочется.
In this picture we can see a family in the weekend. Little girl play with a dog. She threw a ball to it and wait when the dog will catch it. It seems they are having a great fun. Her elder brother plays basketball. I suppose he is a sportsman. Their mother lay in the chair. She is reading the book. Near her we can see a glass of water. Also I can say that weather is fine: the sun is shining, there are no clouds in the sky, it is not windy.