The last line (e.g. playerPictureGroupName "PlayerPhase")

in each Player enity file points to a playerPicture file (e.g. PlayerPhase.playerPictures)

These are similiar to the brush files.

I think the only problem is that you just need the same amount of pictures for each race.

I hope this helped cause i only added one new picture for each existing race in my mod.

*EDIT* i forgot to say:

the playerpicture files are in the "window" folder where also the brush files are stored.

The order in which they are displayed is the same as that in which they are listed when you cycle through the options to choose one.

That order is controlled by a value in the player.entity for each race.  By default, TEC is 2, Advent 1 and Vasari 0.  Highest value comes up first.  If you assign each of your new races values 3 or higher they should be the first races to display in the order.  If you want them mixed in with the original races you can use equal values (IE, you can have 2 or more races with priority value of 1) and alphabitical order will determine which of equal priority displays first.

Hopefully the above makes some sort of sense and you can find what I'm referring to.

-dolynick