where I circled looks like pasted there, also note the shadow man's face holding the rod appears like the sun is behind him, and shadow on man holding fish the sun is in front of him.
The sun is
above the people, not behind them; look at the shadow under the right gunwale and the shading (but not shadowing) of the port side of the seat structure. The disproportionate look of the fisherman's legs is due to artifacting from severe JPEG compression, which renders it almost impossible to detect artifacting from photo editing.
On the other hand, the shadows are consistent across the entire image; part of the confusion seems to stem from the fact that the man hauling the tarpon out of the water is
not standing upright -- he is leaning back to use his weight to help get the fish into the boat. The fin on the left side of the fish is also elevated above the level of the deck, distorting the perceived position for its shadow; between the man leaning back and the elevated position of the tarpon fin, the shadows create the impression that the left figure has been pasted in from another image.
A completely accurate evaluation of the image will probably not be possible without getting a copy of the image before it was compressed into a .jpg format.