In this website on Talavera (in spanish)
More Bueno plates can be seen, this time properly credited:-)
You can also try http://www.researchingdragona.org/ . (Click on "Láminas"). Not all plates, however, depict either Napoleonic or Spanish soldiers; and most of "Napoleonic + Spanish" seem to belong to 1808-1809 rather than 1809-1812.