[quote=@MahouOppai]
I'm a bit nervous about the first Ic post being too short or not detailed enough... 
[/quote]

It's perfectly fine!

This isn't advanced, so no need to worry so much about that sort of thing. While my own intro post admittedly will probably be somewhat long since I have a tendency to get carried away, (too much so, sometimes) I think yours is absolutely fine. 

It got everything it needed to across, and it introduced your character. That's all any intro post really needs to do. Length and detail are good, but sometimes less is definitely more. No one wants to read multiple paragraphs describing one thing or action, or situation.