Blood Harvest: Something Evil This Way Comes

Alright, first I would like to apologize to those who have trouble viewing this because it is so dark.
 
But to explain this picture - the building is a storage shed/shelter for survivors of a ravaged Earth. The figure sneaking up on the shed is a zombie like creature intent on killing/eating anyone inside the shelter. You see, my oldest brother wants to design a computer game. In this game, he wants to combine the elements of Resident Evil, on-line survival/rpg gaming, as well as some concepts from Harvest Moon (believe it or not). Basically, in a post-apocalyptic world, you have to raise/scavenge for food, worry about mutated plant and animal life, plus the threat of 'zombie' like beings that roam the land in packs. This is the very first sketch that my brother and I have done, and it was a joined effort (I did the preliminary sketch and Frank, my brother, helped with the details and shading). Also, the name 'Blood Harvest' is simply a term that I use in reference to this project. No name has been decided for certain.
 
I am also aware that this is, by no means perfect, but I am quite proud of it and I hope to produce more pictures with my brother for his game idea. Any positive feedback, or constructive criticism, would be gladly welcome.