One of the most thorny problems confronting the painting tutor is putting across the need to eliminate unwanted detail from a subject when the student has already been told to work directly from the subject and produce a careful rendering of the scene. As landscape artists we go out into the countryside to seek out visual material to work from and use as a basis for a composition, yet in order to produce an interesting painting we need to filter out a lot of extraneous detail. I am not interested in producing a photographic response to a scene where everything is laid out meticulously.
For these stones I used a number one rigger brush - a very fine instrument with long hairs, ideal for fine work. Where I describe a number of stones in a wall I tend to ease off on the pressure where I want the stones to become lost, but another method I employ is to draw in a few more stones than I actually need, again with the rigger. Whilst these are still wet I then wash over the edge of the painted stones with one of the colours found in the wall, thus losing some of the stones at the edges, and at the same time creating a gradual losing of the detail that can appear more natural. An interesting exercise you can do is to paint the same scene twice: once in extremely strong detail all over the composition, and then again in the manner I've described above. By comparing the two results you will learn much about restricting the urge to include everything in a painting.