Wow. I bet all these experts in the comments section must have so much authority behind their opinions to criticize Ramírez techniques; not to mention traceable history in the art of luthierie.
Why would you even consider using color dyed veneers at the first step of building the mosaic log. A handcrafted Classical Guitar is already close to being a piece of Fine Art. Would you use a crayon to create a Painting? It's time to be creative and incorporate some natural wood veneers like sycamore, satinwood, maple, padauk, & from the wood already present in the instrument, etc. This is not a "paint by number" picture we're painting here! I could never understand what many Luthiers were thinking here.
Because in Spain, the guitar has a headstock that reminds of the cathedral towers; the bridge are the steps before the entrance; the guitar's main hole is the large round window above the entrance, and is decorated with intricate stained glass. Therefore the elaborate mosaic-like stained wood pieces are used. If you leave out stained glass, then the cathedral may be reduced to a small and poor church; nothing wrong with it. But the rosette has its place in great, traditionally handmade guitars.