I have purposely been non-specific about the graphics software package I used to produce these artworks. By current standards it is rather antiquated and consequently no longer available. I continue to use it simply because I am experienced with its operation and it is still capable of producing what I ask of it.
Any graphics software is only a very useful tool and the exact software employed is not that important as being experienced and familiar with its operation. To that end I recommend anyone interested to begin learning with a current package and to persevere with your chosen software.
There are no short-cuts here I'm afraid, proficiency is only gained with time, effort and a lot of trial and error. But I hope you will agree that the results can be well worth it.