Scale arrangement, toe/digit number lack of eyelids are all good starting points..however if you spend your days in the scrub or in field guides it helps too
Ok then if it is not on a rock then I am still thinking Lucasium or Diplodactylus. Wish I knew more about scale arrangements on geckos I am sure there is a good characteristic in that pic I am not seeing.
Lucasium alboguttatum or L.maini?
And if its not a Diplodactylus or a Lucasium, I am going with Crenodactylus?