Do I have to break down phrases into individual words - or does it happen automatically?

[eddleetham]

On another library I use, if I enter, say, "railway station" as a tag, I don't need to enter "railway" and "station" separately as the search engine will automatically recognise individual words in all the tags.

 

Does thas happen in Alamy?

[meanderingemu]

it recognises individual words and permutation 

 

so if you enter "railway station" and "Radio gaga"  in your keywords, people will find your image searching for "Radio Station" 

 

you may want to personally test impacts of various options to optimise your results.