Online fly pattern database design (feedback requested)

http://www.montana-riverboats.com/Fliesdb/index.php


I'm finally getting around to building a fly pattern database.
This will be a public, queriable system that returns links
to remotely-located pages. That way I don't have to ask
people to upload images, and store tedious amounts of data
on my server........I can just make links to pages that
already exist somewhere else.
And then make a convenient way to find those pages.

Users will, in effect, be able to say:

"show me all the links to pages
where fly is a dry fly
and imitated_species is "mayfly"
and this here fly is an instance of "pmd"
and attribute "dun" is true
and attribute "parachute" is true

.....and then get a list of links.
The low-level database details are only
of interest to nerds. But I do need
feedback on the form.

What "attributes" are missing?
Plenty are (missing still).
I just thought I ought to get some feedback
at this point.

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