This is really impressive characterization, the concept is true to design, the smirk and single raised eyebrow are very indicative of Sombras personality. I can really see your own art style injected into the sketch and it looks really nice. You said in your reddit post that you're still a novice, if thats the case i can't wait to see how your art will evolve in a year, you have a lot of talent, keep up the good work.