This template is linked to my recent video about marketing over on my youtube channel.
Although you can jazz these up to add a little personality, I do think that this alone is a pretty good way to contact others. This is slightly different to the video version, but either would work fine. Please feel free to copy and paste this;
I wanted to introduce myself. I am a commercial photographer based in XXXXXX. I specialise in XXXXXX and I have recently been shooting for: LIST OF CLIENTS AND JOBS.
I have attached a copy of my portfolio as a PDF to this email. It would be great to arrange a time to meet with you to discuss any potential collaborations that I may be suitable for with your agency.