Artist's commentary
Happy birthday 😊🙏🎈🎊🎁🎉🎂🥂🍾
#kaitentsuzuri #kaigartexhibiten
The second hashtag is a pun, actually clever on the original: "絵画展" and "廻画天" are both read "kaigaten", the first word means (art) exhibition, the second one replaces the kanji with ones that are read the same and are from kaiten's name.