Realistic Creeper

I felt like doing some concept art for an already existing character. I used to play a lot of Minecraft, and i noticed a lot of people try drawing the enemy known as a 'Creeper' in a more realistic format. I though I'd give it a go myself. (Note the picture to the left is a screenshot of the original character, I do not own that part of the picture).

1) Getting the figure right

2) Refining the line

3) Colouring

4) Shading and Lighting

5) Extra details