Also, with subspecies, what I'd do is I'd have the artists compare different individuals of that subspecies visually as well as discussing with zoologists on whether or not they'd be viable to split
For example, with tigers, I think having a generic mainland Asian tiger would be fine. Perhaps have the coat vary in fluffiness depending on the temperature and region (for example, Bengal tigers that live way up in the cold mountains of Bhutan look just like Siberian tigers). However, I'd definitely have the Sunda Island tiger (represented by the Sumatran tiger) as its own subspecies.
Same with the Southern lion (represented by a typical Southern/Eastern African lion) and Northern lion (represented by a typical Asiatic lion)
Then some others like zebras, leopards, etc.
However, for species like either of the two black bears, cougars, moose (maybe?), etc., it's not that worth it and you can just include high variation
For example, with tigers, I think having a generic mainland Asian tiger would be fine. Perhaps have the coat vary in fluffiness depending on the temperature and region (for example, Bengal tigers that live way up in the cold mountains of Bhutan look just like Siberian tigers). However, I'd definitely have the Sunda Island tiger (represented by the Sumatran tiger) as its own subspecies.
Same with the Southern lion (represented by a typical Southern/Eastern African lion) and Northern lion (represented by a typical Asiatic lion)
Then some others like zebras, leopards, etc.
However, for species like either of the two black bears, cougars, moose (maybe?), etc., it's not that worth it and you can just include high variation