so for one i do think you did a good transition of the concept into the overwatch universe in terms of proportions, i do love the concept a lot but its a bit too toony for what overwatchs style is. maybe the eyes are a bit too big still and could feel a bit more humanoid. i will try to stick to your work and not compare it…
Yes, they will be. The seems in your screen is not related to thin triangles . While thin triangles are not ideal you can't get rid of them completely for low poly game style models. But if you model for Arnold offline rendering you should use quad only modelling probably and use normal maps only for tiny hi frequency…