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Please check the following sentences are correct in the grammar.

There are four children. One is a boy and the other three children are girls. Tall girls are holding dogs each. Those dogs are connected through a blue dog lead.
Especially since the girl in the very left side on the picture wearing a sky blue pants and plum-coloured T-shirt makes a big smile, I feel happy on watching this picture. I feel the smallest girl looks a younger sister of either the girl in plum-coloured T-shirt or the girl in a white T-shirt with the yellow sunshine shape. As I said in the beginning, there is only a boy wearing a red T-shirt with the shape of yellow flash on this picture. He is just standing, vacantly staring the left side like a robot.

Thank you in advance for your teaching.
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There are four children, a boy and three girls. The two tall girls are holding dogs, who are tied together with a blue leash. The girl on the left, wearing sky-blue pants and a plum-coloured T-shirt, is smiling, so I feel happy looking at this picture. The smallest girl looks like the younger sister of one of the other girls. The boy is wearing a red T-shirt with a yellow lightning bolt on the front. He is just standing, vacantly staring like a robot.
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Ah! My sentences were perfectly wrong compared to your sentences. Thank you so much for your teaching,Mr.MicawberEmotion: embarrassed.
Oh! Could I ask you one more? Is it okay that "The two tall girls are holding each dog" in grammar? Thank you in advance for your additional teaching.
Son James"The two tall girls are holding each dog"
The structure is not wrong, but the word use is odd.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you for your answer,Mr.MicawberEmotion: embarrassed.