Did you take these?
Implies you are in possession of the photos, or that they are close by, and you are referencing them physically/pointing them out.
Did you take those?
Implies they are in the possession of the other person, or not close by, and you are referencing them physically/pointing them out.
Did you take them?
A more general way to refer to the photos, as a concept/idea only, without reference to proximity/possession. Perhaps the photos are not present, or they are already a known part of the conversation; you are discussing them without referencing them as being physically present in some way.