The promise to protect (Gintama - 4 devas arc)

This is Part 1 of my 4 part Anime drawing project -Anime Window
This is a drawing i did of the Anime Gintama
Found a pic on the net and decided to draw it (cred to original artist-whoever it is)
Yes i know there are some obvious mistakes haha

Size A2
Drawn with, 
tinted charcoal
water colour pencils
normal colour pencils
black pen
eraser