This is the colour mock up for the The Toymaker TIMETEAM illustration. It was common practice for me back then to photocopy a bunch of copies of the art to practice colour svhemes on before painting the original art. That's all gone now and we no longer see the various decisions an artist goes through when deciding what's best - just a bunch of deleted layers. I find this kind of a shame and have a draw full of artwork in the studio from aborted designs to colour mock ups like this.
I've always been fond of The Toymaker costume design - kind of like an intergalatic mandarin , played brilliantly by Michael Gough. In the story the Doctor and his companions must beat his games and this gave me an opportunity to use the idea of the gameplayer overlooking his metaphorical board as the pieces are moved and the protagonists try to survive. Not sure where I was going with the colours - apart from it being fun. These were painted with Dr Martins liquid watercolours ( that you can still get) - back in the 1970s and 1980s every studio worth their salt had a set plus Pantone markers. I used them recently to paint Spikes Harvey Rotten ( see a few posts back).