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If you want to make the site more useful to beginners and non-dipterists, 100 photos isn't going to help with species determination, but it might help with family. But for this better would be a set of good habitus drawings, with some size statement, chloropids for instance are usually smaller than syrphids, this should be paired with wing venation diagrams. This would give a rank amateur with a little intelligence a chance to get to family. There should be a link to the image gallery coming up with one typical, perhaps the most common family representative, with below it two links, one to the ten or so most common species for this family, and one for all the available photos of this family.

Also on the habitus page should be number of species, with a link to regional and perhaps country breakdowns, so you amateur can see that in Europe there are 1659 species of cecidomyids and 27 photos in the gallery, so they would know, ah hem not much chnace here.

Also you could have a link from each photo giving a country distribution and habitat break down, plus seasonal data.

Now all you need is 500K of EU money to pay some people to do all the work, you'd be better off singing discordant music or writing illitterate poetry.
B)