These spiders are a couple of Epeus flavobilineatus (Araneae - Salticidae) showing some of the features that allow to distinguish females and males (sexually dimorphic characteristics) in this species (the top image is a mature female, and bottom is a mature male).
In addition to the coloration of the head (cephalothorax), that is different between sexes, the appearance of males is remarkable by a prominent conical comb of upright setae (long hairs) on the posterior half of the eyes, arising from a semicircular base that is absent in females, which gives the males a mohawk style.
The species occurs in Singapore and Indonesia
References:  - 
Photo credit: ©Gavin Arachne | Locality: unknown [Top - female] - [Bottom - male]