Try to narrow to a period in time, to a style, and then to an artist.
You'll get better at this the more you study art history, but remember that you have an instinct for it as well. Even honeybees can differentiate between Monet and Picasso paintings! Play art history quiz games online or on your phone to practice identification:
Think about all those visual elements you identified and interpret what they meant, to the artist, to the period, and to that discipline of art.
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