This is cool. I love the style. The only thing I would suggest is to leave in more of the darker value. For example, leave more areas... unscratched (?). (That's what this looks like to me... scraffito). Leaving more areas blue in this pic will show off more of the picture itself. ...if that made any sense. lol. Maybe even use the blue you have on there as a middle value? And use a darker value for the darkest parts?? It's a possibility. Yes, anyway... the face is very well done considering the style! Tres bien!