This is quite a short summation of their physical outlooks - "The Avians of my design are petite people, with adults about the physical height of a teenage human (14-16 of age). Comparatively, they are taller than dwarves and much more slender of frame. They have a pair of properly sized wings located on their hips. The wings are usually of a variety of bright colors, resembling more of the wings of tropical birds than predator birds. Their physical abilities aren't anything spectacular to boast about, other than their ability to fly and hawk-like sight. They embody the idea of nimble and dextrous than brute strength and stamina. The design of their clothing is a mixture of mostly nations around the Silk Road, as the faction of avians are nomadic in nature. The avians are always beautiful people, echoing with the idea of tropical birds being flashy and pleasing to the eyes. To the general populace of Wesnoth, the avians seems as if to only have a single gender - females. That is however untrue, as the males tend to look like females, and in most cases - much more beautiful. The males have a huge tendency to make sure that they are always pleasing to look at; similarly as male tropical birds (but their reasons are for mating).
Having a rather 'brittle' or weaker physical build, they are not able to easily achieve flight with heavy armor; thus the general design of the faction involves a lot of lightweight armors such as leather, cloth or silk. They wield small metal bucklers as shields, while their weapons are always a mixture of wood and steel in favour of a lighter weight."
Here's another variation of my design - with the males looking more like males than this updated version. Slightly more in depth. If I can find my other RPs with avians, I'll include them in for reference. >>Avians<<
For the Lizardmen, well - they can be either Savrans, or more likely to be inspired by the Lizardmen in Suikoden.