From bottom to top, and left to right:
Generic Halflings, Gnommunai (Elves but small), Dverga (Dwarves, made of stone).
Seafolk (Fishy), Orcs (Fanged), Generic humans (everyone's human, but you get the picture), Alfar (Elves, also highly varied in their own right), Stelmati (essays could be written about the way they souls work).
Striga (Owl people), Ithikkos (Made of stone but not short), Half-giants (Generic humans got busy with Blue giants), Ascetics (strangest way of life here).
Blue Giants (Quite widespread and varied), Forest Giants (tree huggers), Dhegdeer (tall elves).
Fomoraigh (Red giants), Matsieng (Fishy, and also very big).
This is a rough representation of the races in my world. These are categories that are applied in-world, but don't often see use. In all these categories are more granular categories that actually see everyday use. In no case is this clearer than with the "normies". These "generic" races, defined as having a lifespan similar to irl humans, are about what you'd expect, but in this category exists the greatest variety by virtue of how widespread they are and their proclivity to... canoodle with any and all of the other races.
Major criteria for the categories presented here are Lifespan, Average size, and Weirdness. The first image is an attempt to capture their average heights altogether.
In-world criteria base themselves mainly with "origin", many of which have been forgotten, but are still spoken of in generalities. All Alfar, for instance, believe to have been carved from trees, Dwarves and Ithikkos from stone (from cave and mountain respectively), etc. The kind of tree, and/or the kind of stone, and the location of their specific origin, are further details that form unifying narratives for these races. Naturally, thousands of years of history make the origins and specific ancestry of anyone truly dubious. Many races have a short enough history that they don't concern themselves with their prehistoric origin story at all.
This basis also makes for some false groupings. For instance, there are several races of "generic humans" with crimson skin. Due to this, they are falsely assumed to share an origin with the Fomoraigh. This association has gone swimmingly for everyone involved. No genocides have occurred whatsoever. It's all hunky-dory in Ag-Aistru.
Questions are welcome. I can break down some of these categories into the actual in-world races as they describe themselves, up to a certain point. Naturally, some of these have more lore than others.