You may use my pictures for purely personal, non-commercial uses, such as for screen-savers or a school reports without asking my permission. Similarly, you may use any of my image(s) on your website if the site is purely personal (non-commercial) or is for a charitable, section 501(c)(3) organization, provided--(1) you credit me as the photographer by including a link to my site, such as "Picture(s) courtesy of Keith Stanley, www.kestan.com," and (2) you send me an email with the web address of any page on which you use my image(s). You may email me at email@example.com.
For commercial use of my images on websites, in printed media, or otherwise, I generally ask a licensing fee ranging from $50 to $300 per image, depending on the picture and the use (some high-end uses may be more). For any such uses, or other uses not covered above, please email me to discuss further: firstname.lastname@example.org.
Finally, notwithstanding anything I've said above, any of my pictures may be used for any use, whether printed, online, or otherwise, if the user fully complies with all the terms of the GNU Free Documentation License. See http://en.wikipedia.org/wiki/GFDL and http://www.fsf.org/licenses/fdl.txt.
Washington, DC, images:
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Prints of images are available: Photographic Prints.
Washington, DC, photographic services: I am available for photographic assignments at rates such as we may negotiate.