That is a great photo. I personally don't believe that orbs are beings of any sort, as orbs can be reproduced easily with a bit of dust between the lens(or even on the lens) and the subject, the light of the flash, or in this case sunlight captured reflecting off the dust creates the effect. As for the faces it seems to be something that happens with a lot of lens flare type dots; I am not sure why as I am no photography expert, that is just my understanding from previous readings. I have a cheaper digital camera that I use for the fire department that causes "orbs" anytime that there is a single speck of dust on the lens and needs to be kept clean otherwise the photos are full of orbs...That is just my experience though and I don't want to bash your own beliefs on the matter.
Personally I think that getting photos of human like shapes is much better evidence and there have been some great examples that I have seen that I put much more stock in.
You have a very nice camera, it does take great pictures though