#1. Avoid the use of plurals unless absolutely necessary.

A search for...		will find...
Subject:		All photos of dolphins.
Subject:		Only photos of that have more than 1 dolphin in the frame.

#2. Be as precise as possible.

A search for...		will find...
Subject:		All photos of sockeye salmon taken in Alaska.
Location:

#3. When using multiple criteria within the same field, separate each criterion with a comma. Think of a comma as an "or". (e.g. "Salmon, Glacier" should be thought of as "Salmon or Glacier".)

A search for...		will find...
Subject:		All photos of salmon or glaciers from Alaska.
Location:
Subject:		All photos of humpback whales from Alaska or Hawaii.
Location: