Ok, I did soften up the fur by making the bright parts even brighter, by applying one of the tails shades as the color underneath the highlighted bunches of hair and I merged some of those individual(actually they were not intended as individual hairs already and rather as grouped up bunches of hairs but maybe that was not done radical enough) hairs some more.
To address the right-angled-ness, I tilted the belt a bit. I did not think I was allowed to bend it like you did in your edit tocky, because it is practically directly located at the eye-level and thus not allowed to form a curve like that there but I can justify the tilt by the fact that the mini-gun is resting on it a bit, pulling it down a little.
I also moved the right (rats left) foot to the left a bit to provide more support for the heavy gun and when it came to the shoulders, I did pull down the opposite shoulder that you had in your edit and justified it to myself as being pulled down by the heavy minigun.
Frankly, I think the belt in your edit makes it look too much like the rat is bowing forward (it collides with the horizon) which she is not supposed to be doing. If anything, she's leaning backward a bit to provide some counterweight to hold up the heavy gun.
I hope this does not sound like your edit is completely useless to me, in fact it is not, it's helpful, as it helped me see that the right-angled-ness was indeed looking a bit too boring and that some variation of those angles makes the image more dynamic... still not as dynamic as your edit, but I did not find anything that justified such drastic changes in the pose.
updated version:
