Nice website, if you are planning on doing stock with people it might be worth creating a separate section where you could advertise 'photos for signing MR'. It works for me, a lot of people will be happy to have few portraits done in exchange of doing some others more stock related shoots.
I have the same equipment, but later I bought Nikkor 55-200mm, it's pretty good! About the website it's nice & simple, but in my humble opinion you should use smaller or different watermark cause it's killing the beauty of some images! Good luck! :)
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