Bloody bloody Mary, tell you what you just say?

First off this art style is very pleasing to look at. The anatomy is spot on and it's clear you've spent a lot of time practicing it.
The linework is consistent and very clean so I have nothing to nitpick there. However the lines inside the ears seems a bit much especially when it's not shown in any other parts of the peice ( if this is just part of the design or something the commissioner requested I apologise) .
Something small I noticed was that in some parts of the fur near the back of the head the lines become a bit thicker. It's not super obvious but once you notice it it can be a bit distracting.
It might help if next time you try comparing the thickness of your lines to the rest of the art from time to time.

I'm not going to critique the colour pallete because it's a commission and you obviously didn't pick the colours yourself.
Like I said before the anatomy is pretty much flawless for the art style you have. My only minor criticism is that the muzzle looks just a bit too big apart from that there's not really much to criticize.

Overall this peice is very nice with very few flaws. Well done! You've earned yourself a watch <img src="e.deviantart.net/emoticons/s/s…" width="15" height="15" alt="" data-embed-type="emoticon" data-embed-id="391" title=" (Smile)"/> I hope you liked my critiquue and that it helps in some way <img src="e.deviantart.net/emoticons/s/s…" width="15" height="15" alt="" data-embed-type="emoticon" data-embed-id="391" title=" (Smile)"/>