18. https://www.inaturalist.org/observations/249880717
Probably Eurema brigitta (drona).Uncertain.

This is just too vague. The HW hides the FW cellspots.
Hw spot 7 is almost touching the FW cellend spots/marks.

This cannot happen in E. nicevillei as thet are far apart.
https://wingscales.com/Pieridae/Eure...lei-nicevillei

E. sari & simulatrix have prominent brown patches on FW apex.
E. andersoni have a tailed Hw spot 7

E. hecabe have angular HW & E. blanda have a curved hW spot 7.
E. hecabe.
https://inaturalist-open-data.s3.ama...4962/large.jpg
https://thaibutterflies.com/wp-conte...a-hecabe-3.jpg
E. blanda.
https://www.butterflycircle.com/chec...an-Ben-JIn.jpg
https://www.ifoundbutterflies.org/si...431_261668.jpg

This leaves E. brigitta (=drona)
Often with reduced vague markings ;FW cellend makr twin spots.
https://yutaka.it-n.jp/pie/21200020.html
https://www.ifoundbutterflies.org/si...397b5571-1.jpg


19.https://www.inaturalist.org/observations/248154317
Pemara (Oerane) pugnans.

Note downturned antennae; FW subapical spots 7 & 8 smudged black.
yellow spots.
https://www.butterflycircle.com/chec...20-%20Khew.jpg


20.https://www.inaturalist.org/observations/248154315
Female Potanthus serina.
Note black abdominal end
FW spot 5 smaller than spot 4.
HW band with a smaller inner spot 6.
Male & female.
https://thaibutterflies.com/wp-conte...hus-serina.jpg
https://www.butterflycircle.com/chec...ale_Horace.jpg
Compare.
https://inaturalist-open-data.s3.ama.../original.jpeg