I’m afraid these were all done some time ago using an airbrush, my digital abilities are non existent other than a bit of re touching. I now have a good friend and colleague who takes care of illustration work on his powerful graphics computer.
Do please contact me if you have a need to come up with a technical illustration, here are a few examples…..

This airbrushed picture could do with a little more detail and texture here and there, but I’ll put it in for now. It shows a G.W.R Star class No 4027 ‘Norwegian Monarch’

This fine looking Marsh J class 4-6-2T No 2326 was to have been named ‘Grosvenor’, but in the event became ‘Bessborough’ when it emerged from Eastleigh as one of a slightly dissimilar pair designed as express locomotives in 1912. The sister engine ‘Abergavenny’ had different valve gear and larger tanks.
Quaker State Motor oil.