How to make sure your work is found - Help needed!

Further edit: The article won't come because I found out that keywords aren't as important anymore to have your work found than they used to be.

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Got any more tips, or tutorials you can find? Please tell me soon! I might make an article if I get enough tips. Every contribution is appreciated and will be credited

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If you want your art to be found through search, it's more important than ever to use the right category and keywords. So my question is, do you have any tips for your fellow deviants on how to pick the right category and keywords?
Please comment and tell me all you know, and I'll make a list here with all of your tips (I will probably summarise them to like a short headline and add a link to your original comment - you will also be credited, of course).

I'm looking for any tips on how to make sure you have the category, and how to pick good keywords, basic or advanced, in general or in specific situations (say, for stock in particular).
...And maybe you know some good resources that have tips towards this already?

Thank you all! Here is the list!

Visual art - describe the image. Colours, shape, emotions, content, composition...
GabrielleBonez explains here.

Follow your feeling - mention the mood.
Suggested by ArwenGernak here.

Think about anything the deviation looks/feels/tastes/smells/seems like.
Suggested by xblackxbloodxcellx here.

IIIXII has a great tutorial called Maximizing Your Keywords.
Recommended by 3wyl here.

Include username and category in the keywords.
Suggested by AlecWolfe here.

Add the main keywords in multiple languages.
Suggested by KwehCat here.

Add misspelled versions of main keywords.
Suggested by Sifelif here.

Add alternative spellings and synonyms of keywords
Explained by Bewinxed here.

Think about what mediums/programs/gadgets you used.
Think about the purpose and targeted audience, too.
Suggested by kisaki-akizuki here.

UnicornReality has a Keywords Tutorial for stock artists.
Suggested by Amarie-Veneanar here.


Groups that explain the category
Gallery info button explains the category
Otherwise google definitions of the term
Contributed by WyvernLetDie here.

Note that it's easy to change the category (namenotrequired; see GinkgoWerkstatt' Change Deviation Category Tutorial).
Consider the categories as they come along.
Explained by AlecWolfe here.

Follow your instinct - especially if you're torn between several options.
Ask in the artist's comments what other people think.
Suggested by xblackxbloodxcellx here.

Think about what mediums/programs/gadgets you used.
Think about the purpose and targeted audience, too.
Suggested by kisaki-akizuki here. (Yes, these tips count for both the keywords as well as the category)

Featured FAQ
_{Just because I always do these and it's pretty relevant here}
FAQ #577: How do I use the Search?