Westbound (that is arriving in North America) the ship is always heavily loaded. Once it has completed its US calls and turns Eastbound it is more lightly loaded and has fewer boxes on deck. The trade imbalance of imports versus exports becomes pretty obvious as does the quandary of how to return empty boxes to Asia when there is no revenue in doing so.
YM Modesty is one of those repeaters, as it shows up regularly for the Alliance, both eastbound and westbound. Its arrival today on the Eastbound leg gives an opportunity for such comparisons.
November 2: Westbound
July 20 2018: westbound
Some rather obvious things jump out to me:
First: the ship was more deeply loaded westbound in 2018.
Second: the ships was more deeply loaded eastbound in 2018.
Third: slightly more empties (on the after deck) in 2019 eastbound.
Note also the many new or newly repainted ONE (Ocean Network Express) boxes in 2019, indicating that the merger of the three primary Japanese container lines (K-Line, NYK and MOL) is slowly taking effect. Are they scrapping old boxes - effectively abandoning them in the west, and building new ones in the east?