three vessels with crew are shown in the main composition, which is focused on a large boat with giant figures.

The main image shows a large square boat five figures, two larger than the others.  The two larger figures are apparently holding bows, horizontally, and have two vertical lines coming from their heads, curved at the tops - usually interpreted as plumes. 
The boat itself features decoration at the prow.
Both the boat and the figures are pecked out to give them substance, which is a technique common to most of the images at Site 26.

The two smaller boats are each distinctive.

The one slightly above the main image is another square boat, with one large figure, with plumed head gear, and a much tinier 11 person crew.

The second boat has a crew of 12 individuals.  Hovering above it is a large figure.  this is much less clearly drawn than the other figures, but appears to have the same plumes, and has outstretched arms.  It appears to be superimposed over an earlier image.