Guatemala, 0.5 Quetzal note, 1980.  Tecun Uman and a quetzal (bird) on the front;  Mayan Temple I at Tikal on back. 

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Costa Rica, 5 Colon note, 1981.  Perhaps the most colorful money in Latin America.  Rafael Iglesias Castro and an orchid on the front;  the painting "Alegória", by J. Villa, 1887, on the back.  This painting hangs in the foyer of the National Theater in San José.  Here's a large detail of the painting.

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Nicaragua, 10 Cordoba note.  Here's progress for you:  First the old 1972 note from the Samoza days;  then the new Sandinista-era version from 1979.  Both have Andres Castro on the front, but in the new version, he's now raising his arm in a defiant salute!  The back of the old version has the Hacienda San Jacinto building, while the new one has "Nationalization of the Mines", and a watermark of A.C. Sandino himself.

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Nicaragua, 50 Cordoba note, 1979.  Sandinista martyr Carlos Fonseca on the front.  The back has a scene of the Day of Liberation of Managua, with Sandinistas swarming the Cathedral square.  The old 50 Cordoba note (not shown) had cattle grazing on the back.