Hi Dovedragon!
The closed eye pose is a glitch -- your forum avatar gets updated every couple of days (I don't know the exact time), so the closed eye pose/white eyes is a glitch when the screenshot isn't refreshed properly -- it goes away once the profile picture is refreshed again. You can get different poses (attacking/standing) if you go on the game and press equip: on the bottom of the tab, there is something that says "Update Forum Avatar: Sitting, Standing, Attack". Click whichever pose you want and confirm you want it updated, and then it will appear on your avatar!
Hope this helps!