I'm not much of an Erwin fan (I like his philosophies, just not... him.), but I do like your vision. And (because I'm a Levi fan- go figure), I REALLY like this. Levi looks his age and his expression is accurate, which many people have trouble with. Also, this is a realistic perspective, and I think it's one of the best fanarts I've seen in a while. Love it.
Oh my god... This is just like candy or something. I love this semi realistic style, it's just soooo beautiful! And you really know how to draw with a pencil. Urgh Levi looks so good and it's so cool that you managed to make him look like he does in the original style. Those eyes!!!! Beautiful!!!!!