Style guide
1) My usual - Semi-realistic, designed to look as much like the original species as possible whilst still giving a little more expression.
2) 'Classic toon' - Semi-similar to a few well known animation studios. More toony, still more recognisable as the species but with more expression. (In this examples case similar to Djali in hunchback of notre dame)
3) 'Super-cutesy' - Big eyes and lots of expression, less variation to show species type but more elastic features for dramatic expressions. Almost child-like appearance. (in this case similar to Dawn Bellweather in zootopia)
4) 'chibi-ish' - Chibi styled but with a reasonably detailed body rather than all the focus being on the face/head area. Less obvious as to the species but cute to look at.
___________________________
These are styles for lined and shaded work ONLY, not my painted work, which is a whole different ball game and tends towards realism across the board.
Below are examples of background styles
Simple - eg: Colour gradient, underwater effect or colour blobs.
Complex - eg: full painted scenes
VERY complex - eg: Lots of detail elements (eg, man made items/man made interiors)