[Ruphin]

Look at the pictures of sample hands in the link you posted. From the position of the hand and fingers it's unlikely they are software generated, but they have the same "neat" aesthetic as the other pictures.

I think what you're seeing is just pictures taken by someone with attention to detail.

[fabiensanglard]

Yea it takes a while but I have a playmat to guide.

Also, the Lightning bolt is wrong in the upper left corner (https://fabiensanglard.net/mtg_extended_1997/deck_necro2.png) but it gives a little "artisanal" feel to the overall so I am going to leave it this way.