As an example, can you use it as a facebook avatar? SURE.
Can you use a picture as a headshot for a conference program? NO. Get in touch with me, however, and we can do something awesome for your commercial purposes that is tailor made for you - you won't be disappointed.
Include credit and link to my site if using photos, please.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.