Hands
Before I start saying anything the first thing I noticed on her is that her hands appear to be a bit bigger than usual. Did she eat something that she was allergic to or what?
Now that I have that out of the way I have to say you did an impressive job here actually. The outfit looks pretty cool and I can tell why it is rated M. Mostly because she has no panties on but aside from noticing that and hands she looks pretty casual (and by casual I mean she has a usual grumpy look on for no reason) and she looks partly unpleased at whatever the patron or master ordered.
The artwork looks really nice so good work here on this.