Because it's you, and you know I'm not being mean for the sake of it, I'm going to say no, fella, those don't work. They're letting down the rest of your (excellent) piece.
They're unclear, the two circles are wonky which is really distracting as you drew them so boldly, and the size of the lettering is possibly far too big to imagine 28mm
SW put it there. Look at the size of the runes on their armors for comparison.
Can you paint this back to the stone colours as a starting point?
I'd suggest looking at pieces like the Balin's tomb
GW made, and studying some pictures of Celtic runes. Usually they are carved into the surfaces. You could easily do that with a scalpel or even a sharp ballpoint, and then use inks or even "glowing" effects to give it a boost. A space wolf will not be using chalk.
Draw around something to get even, parallel circles, but break them occasionally. Again look at how carvings are done, breaking up the shape gives an impression of how hard the surface being cut into is.
That said, this will look epic, mate if your past constructions are anything to go by.