Ah, the frustration of finding good aircraft images. Don't I know that one? Yep, I do. Well, great thing that you found some.
I am currently working on (using the Fas site mentioned earlier in this thread) a large (well over 150 pictures selected so far I believe, though I don't have so many conversions done) collection of photo-realistic (or as close as I can get) air units, from the earliest days of flight right until now, and the future (eg, F-22, F-35, Mig-35, so on, as well as concept pictures of units). When I can't find a decent color picture, I take good art, or a picture of a scaled model, or a 3d model. That might be helpful in the future for your needs on that.
If anyone could point out good sites for color picture/art of earlier planes (eg, those what were phased out of service before the eighties, especially early jets and World Wars planes) I'd be very glad. FAS provide good coverage for jets more recent than that, but it'd be nice to have them all...