Jonny,
Post your pictures. They're your pictures and you own the copyrights to those images. If photgraphy was not explicitly forbidden, there is no legal or ethical bar to your taking the picures or publishing them where you like.
Do not, however, apply any names to the trees depicted in your images. That is something that one generally asks for permission to do.
Kind regards,
Andy Rutledge
www.bonsai365.com/
zone 8, Texas