If you compare Picture 1 with 2, you will find that the people behind Biden and his wife Jill are two different "sets" of people.
Picture 1 图 1
Picture 2 图2
If you compare Picture 3 with 4, you will find that in picture 3, the lady with a colorful mask is either at a lower position, or much shorter than the lady in Blue at her right side, and there is a man behind her and Jill and Biden.
But in Picture 4, the lady with a colorful mask is of the same height as the lady in Blue, and there seems to be nobody between her and Jill. The man in the Black mask in Picture 3 doesn't exist in Picture 4.
Also in Picture 3, there are several people in black behind the lady in a colorful mask, the lady in Blue is behind Joe Biden. But in Picture 4, between Joe and Jill is a white all, and the lady in the Blue is behind Jill instead.
If you compare Picture 5 with 6, again, you find the people behind Biden and his wife Jill are two different "sets" of people.
Picture 5 图5
Picture 6 图6
If you compare Picture 4 and 7, in Picture 4, there is nobody between the lady in blue and Jill, but in Picture 7, the lady in blue is very far from Jill, there are two people between her and Jill: the man with a black mask, and the lady with a colorful mast.