He looks really much like GW ones. No tail (why???), dog face, strange muscles in the arms and it looks as if you have taken a mini with a great weapon and took it off.
The best rat ogre i've seen was the old bone ripper (the 3 arms one, full of chains and armour and with a tail, of course). Ok, it had an awful face, but was really nice to field a mutated monster. I tell you just in case you want to have some inspiration.

So i would change yours a bit. Just my most humble point of view.