I really don't know the anatomy points for the various species well enough to narrow any further. I'll aim to get some photos in better lighting. This was all with high ISO/low light and has been deNoised and had exposure/brightness etc. altered to bring out detail.
the white crescent around the back of teh head, with paler blotches near the eyes is a good tip to teh Genus Opisthoncus and then go by the pattern on the top of teh abdomen
@MichaelMulvaney I believe this is a juvenile Maratus griseus (yet to be updated in our taxonomy list), with links to reference photos on the species page if you'd like a closer look. Let me know if you disagree! @KorinneM thanks for the effort in editing the pictures! It definitely helps with ID.