First completed digital artwork, thank the heavens for SAI. 
So basically, it still took me 1 week of tireless work, but was worth it. Still need to work on my coloring and lighting (most especially), and my background art needs a lot of work there, but at least I hit the jackpot on my coloring on the subject.

 

Suggestions and criticisms are greatly welcomed and appreciated, especially solutions directly solving my coloring problem. :3