You can give your photos a "tag" or category. You can assign as many tags as you wish to each photo.
There's a bit of an ad-hoc standards list being developed which you might like to refer to.
Here are the 150 most popular tags. The bigger the link, the more popular the tag.
1000somethings 2003 2004 2chan abstract ada aerial airport amalgam animal animals anime architecture art babies baby baseball beach bear bees bluegrass bowenisland cal california cambridge camera cameraphone cat caterina cats cg chihuahua cityproject closeup colorado comic coxy danno dempsey dog dogs dospesos drawing europe family film fish flickr flora flower flowers food found friends friendsters fromtheinternet fun funny garden george glowproject gne gokarting google graffiti green group hawaii home humor idrewthis illo india indoor ituzaingo jasenova kids landscape leavingparty livemusic london maui mavroudis me meer montgomery mouse my nature newsheaders newyork newzealand night notes ocean office orangemapped orava other outdoor outdoors painting paris party photo photoshop photositook pink plane portrait rain random sandwich sanfrancisco screenshot selfportrait sign sky slowakia snagged snow spring stewart stilllife streetart summer sunset sxsw sydney the to toronto travel tree trinity ugat unfound urban vacation vancouver vankie venice visit w3c washingtondc water wedding writers wwwfindcarmofintk zoo
(You can see the list of all the tags here.)
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