Posted on September 20, 2018
This was a commissioned portrait of a young girl and here are before and after images to show how I developed the underpainting. Grisaille underpainting was completed first and then I added some layers of colour glazes. With this method, rather than mixing the colours on the palette the colours are ‘mixed’ optically through progressive glazes – very thin layers – of oil paint with a little medium.
Someone asked me the other day how much medium I use when painting in oils. Firstly I should explain that I always ‘oil out’ the painting surface before each painting session. Some people call it ‘oiling in’ by the way, but essentially it just means taking a little of the medium you are using and applying it to the painting surface. You can apply it any way you want, but I prefer to brush it on (any brush will do but I use a short wide sable brush) and when the surface I am working on is covered I rub the medium off very gently so there should be a very thin layer of medium left. I use M. Graham’s Walnut Alkyd Medium because it has an alkyd resin in it so it will dry in 48 hours. You could use plain linseed oil, it just takes longer to dry. There are quick drying oil paints out there and also siccatives but they are usually made using mineral spirits which I don’t like.
You can see me demonstrate this on one of the videos I put on youtube:
Oiling out is something you just get the hang of with practice. Sometimes I have left too much medium on and sometimes it feels like there isn’t enough. I do it between every glaze, so when a glaze is dry to the touch and I am starting the next I just repeat the process. Once all this is done the paint flows on the surface more easily, but I still add some medium to the glaze as I mix it on the pallet, being careful not to add too much otherwise it gets sloppy and ugly. Having said that I can always pull it off an area of the canvas by using a dry brush. It really depends on what kind of result you are after as a painter, everyone is different and is seeking a different quality in the paint they use.
In the portrait of the girl with a cello I used Raw Umber and Titanium white to do the underpainting, which has a nice warmth to it. Looking at this painting again has inspired me to rethink how I produce portrait paintings. I have found myself pulling against the overly finished and polished style of some of my work, so I want to revisit this way of working with a Raw Umber grisaille. I’m looking for something cruder, looser and freer from the constrains of technique. Sometimes too much knowledge and technique can get in the way of painting. My goal is to be able to paint with more naivety, as well as with good technique.
I was interested in this painting again because I have been struggling with how to complete backgrounds, and finding myself overworking them. I like the simplicity of this background, completed at the underpainting stage. Raw Umber and white has a warm neutrality which works well. I painted this without really worrying too much about it, without technique or overthinking it. I’m presently trying to return to this simpler process, where the focus is on the drawing, the underpainting.