Goldfinch — Giclée on PaperA male American Goldfinch at peak summer plumage launches from a thistle wings spread, the electric yellow of the breeding male almost incandescent against the soft blue green atmospheric background. Thistle seeds drift in the air around it; a companion flower opens at centre. This 1970 watercolour is one of Glen's most chromatically confident pieces: that particular cadmium yellow green of the male in June is one of the hardest colours to render