I dont know exaclty the size to be honest but i want:
1)My Logo on it,somewhere in the center.
2) Down of it the facebook icon and next to it LoL.Mathew
3) If you want to add some camps i would like Wukong (for fire team) , Nunu (for ice team) , Morgana (for dark team)
You can add anything else you think will make it good and attractive.
Also I prefer trans bg.
Skype: Mathew8076 for more questions
PS:I think twitch cover is 1400x580