First of all I'd like to say that this is absolutely amazing! I love it! And thanks for participating!
Now for the critique itself:
I love your oc he looks really cool. Also I love the position you drew the characters in. I love this lining and the coloring is also beautiful and well detailed! The background is also very interesting...
It looks so good so at first I thought this drawing was done digitally.
To sum it all up the drawing is amazing and you are an amazing artist so keep up the good work and I can't wait to see more from you