First I took a good look at the photo I'm working from and drew in the corrections on my painting so far; the left eyebrow needed to be higher, the mouth - lower, the nose and far-cheek needed reconstructing, his shirt and corner of the chair needed dropping, and ear hole was too high. Also his skull needed correcting. Deep breath, at least now I could see my dad emerging from under all that gloop again.
Step 2 was to mix a new set of grays to work from, which took almost an hour.
God, I'm tense. A bit of Bjork 'Debut' any swirly-whirly dancing round the room should loosen me up.