Daylight sighting at Fort Flagler, Washington

During a family picnic and day at the beach. My friend, his children, his wife, my children, and I were taking family pictures at Fort Flagler near the beach.  We had all the children climb up on a huge log and pose for a picture.  At the time my friend took the picture, there was nothing visible that we saw at the time in the sky. When I got back home later in the evening, I was going through the pictures and saw a very interesting object in the sky.  I think that it should be looked at much closer! From what I can tell this is not a bird, or a plane due to the lack of a tail wing.  This looks very symmetrical on both ends and has a protrusion on the top and bottom of the craft.  When the picture was taken, the camera was facing directly south west.  If this is something that is credible enough, I would like to have this photo analyzed.