I have come to Edinburgh to attend the opening of the exhibition of the work of Jean-Etienne Liotard, the Swiss artist who did immaculate pastel portraits all over Europe, not least in London where he arrived in 1753 and made a splash by his Moldavian costume.   It is an opportunity to see his work assembled in a way which is normally not possible because of the fragility of pastel as a medium:  a small, but extraordinarily choice exhibition, pastel being so beautifully delicate and precise in the depiction of fabric, lace, fur and skin tone:-