For many newcomers to Butterflies, the descriptive terms often used can seem like another language, such as Space2, Tornus, Cell, Submarginal spots etc. Accordingly, I have rifled my library and copied some diagrams which, I hope, will help explain some of these alien terms.
Those of you with Pisuth's book will recognise the last three.
With regards to the veins, unfortunately, both the vein pattern and the number of veins very from Genus to Genus. However, the pics show how the numbering works, so they can be used for any species. C&P4 gives the venation characteristics for many Genera.