Firstly, I should admit that I am not en expert on neither traditional nor modern dances. However, I love to watch any beautiful performing arts.
Expert says that Thai classical dance drama include Khon, Lakhon, and Fawn Thai. I feel (not think) the dances performed in these pictures fallen into category of Lakhon. Lakhon features a wider range of stories than khon, including folk tales and Jataka stories. Dancers are usually female and perform as a group rather than representing individual characters.
There is one modern Thai dance performed in this series (last photo).