You can always visit a nearby shopping mall in Singapore to find a printing shop for a quick passport photo which probably takes time to develop the film.
The quickest way is to take instant passport photos; you can find those passport photo booth locations here:
- Jurong Entertainment Centre
- Clark Quay MRT
- Bukit Timah plaza
Note: make sure the booth or photo shop prints out the right sized photo for your passport or ID. For example, US visa application require a different size picture to the standard format from one required for Europe.
If you know other locations, feel free to share in the comment.