HD :
The first photo is taken off the high level bridge you can see in the background of the second photo - obviously with a very long lens ! You can get to this bridge from the Custom House DLR station, just walk towards the dock. The bridge, shown on the linked map, is an interesting experience in its own right.
The vessel in the background of the first picture is the Sunborn Yacht Hotel, a prominent part of the scene. You can go aboard to the restaurant/bar etc, and you may find that the decks visible behind the aircraft offer a good view as well if you can work out how to get there. If the walkway along the dock has been closed you can take the DLR one station east to Prince Regent and walk over to the Sunborn from there.
One station further east again is Royal Albert and this offers the best view of the LCY apron.