Very accurate rendition of a WH40k battle sister indeed. The palette choice, her countenance, gear, gait, you nailed it all. GrimDark alright, with masterful chainsw.. I mean brush strokes. Setting it as desktop wall, right now!
P.S.: her left thigh looks like it's wrapped in leather rather than iron-clad. Still, that does not, in any way, sap the sheer awesomeness of this piece. And I love how the sepia hue makes this masterpiece look somewhat baroque (as in those epic medieval paintings). All in all, very much within the mood & feel of canon WH40K. Looking forward to seeing your rendition of the Living Saint!!!