Rice paper is a very hard medium to work with - as it involves a steady hand and focus to get it perfect, but also a mentality is needed to accept that it may not behave the way you'd expect.
Chinese brush style (the style that is done here) involves the use of ink and water. There are many techniques that enable one to get perfect tone with a single brush stroke, but that's a bit complicated.
Rice paper absorbs water....like tissue paper almost. Thus one has to be very careful when placing a brush stroke - as you do not want a big circular blotch when you wish for a long squarish line. Another aspect of this style is that it is very much like watercolour in the sense that once you've made a brush stroke, that's it. Done. No going back, so one must concentrate whilst doing this - not to mess it up anywhere