The interesting thing is that Juan Francisco does it in a very large scale, his pannels are 2 X 3 meters and his precision is very tight. The illustrations look like photographs in bleu tone.
Currently Juan Francisco is a student at Reale Spagnola Accademy and on an exchange program based in Rome, Italy.
At the Fernando Pradilla Gallery in Madrid you can admire the " Grandes Obras" (big masterpieces) of Juan Francisco all done with his personal bleu Bic pen technique (which I studied in Art Center a long ago...).
Photo Via: www.corriere.it and www.astrolabio2006.it