In my research I did not find any retablos of San Gabriel. Looking at the characteristics of the santero painters, I created this interpretation of San Gabriel, inserting the two symbols from the Annunciation, the lily and the Ave.
The Annunciation: Luke 1:26-38
Have no fear
God is with you
Archangel Gabriel San Gabriel 4 x 6 acrylic on Kozo, mat covered in Chiyogami SOLD, photos available for framing