strenghtening arm, hand and wrist muscles

[sarasara]

It is never too late to start building muscle endurance - just practice and be consistent. It will come. From what you are describing, it is not bulk that you need but control. Adding more protein doesn't help unless you are protein deficient.

Practice, practice, practice, rest and then practice some more!

Thanks alophysio for those encouraging words, I've been doing nothing for six months but drawing hundreds of A4 pages of attempted straight lines from the shoulder; vertical, horizontal, diagonal. I intend to do it for anoher six months. Hope by then my basic drawing skills will be perfected. But until the muscles are there with me I wont have the control and accuracy I am seeking.