Hi Don,
Thank you for your comments and your consistent encouragement mate.
Over 30 years of modelling I've come to realise that it's possible (and in fact desirable) to use a wide variety of paint/ colour media; (oils, acrylics, gouche, enamels, pastel chalk, coloured pencils, water colour paints, printers inks) and painting techniques (layering, glazing, air brushing, stipling etc) to achieve the variety of colour and textural effects you need to create the perception of realism in miniature.
It's a never ending process of experimentation and trial and error, which suits my "make it up as I go along" approach to modelling. Sometimes it fails miserably, most of the time it doesn't quite work but its OK, and sometimes it all comes together.
I think the 3rd New York bust was one of those rare examples where all those different approaches and techniques came together, and Don, I thank you once again for encouraging me to go the extra mile on that bust.
I'm looking forward to finishing this figure and moving on to my next project, but before I do I will add some sweat and some dirt to the Gladiator's skin and shield.