Thank you loord74 for another good effort. I've just two suggestions from the original photos and from my memories of grandad. They are that his face looked more severe in the old original photos due to his lips being less full and straighter, and the end of his nose being slightly lower - as it was when he was elderly - he had a less rounded face which made it look a little long.
Actually a third thing - perhaps his hair shouldn't be quite so fullsome.
But thanks again for your great work and for responding so quickly.