1) I haven’t found a way to put the image counter outside the picture. I think this can’t be done without a slider code rewrite (html structure).
2) As far as I know all text fonts use following font families: “HelveticaNeue”, “Helvetica Neue”, Helvetica, Arial, sans-serif. Only the headlines & blockquotes are different. You can change them with following code – I’d add it to css/custom.css: