To change color of outlines, you will need the Golden Token. The Golden Token is a paid item in the in-game shop which allows you to have infinite petz space, every color of the rainbow, transparency, and many more perks for as long as it is active.
You can also get the Golden Token by watching ads on the TV for free, but for a limited amount of time.
A draft, or petz draft, is a petz that you have been working on, but have yet to adopt. This means that any petz sitting in your "Create" section is a draft.
If you've been working on one device and then open another device and notice the draft isn't updated, log out and back in to get the newest online version.
You can change the sclera colour by simply pressing the little eye button that appears when you are zoomed in/focused on the pair of eyes you'd like to edit.
Note that this button also allows you to colour the lines of the eyes as well, depending on the pair of eyes you chose.