A little constructive criticism

[Andrew Schlageter]

I felt I was growing in terms of light and prospective, so with this piece i decided to push it with more detail since I have .18 tech. pen and colored inks.  I just want to know if the detail is fitting correctly with the light and prospective. 

P.s. two lesser things to know: 1. the background and creature is meant to be purely black & white (the exception of the creature's mouth) and not even able to reflect any color period. 2. the creature's mouth is supposed to contain glowing, red, circles.