Are my mixes getting better? 5150

The guitars sound a bit hollow, but the overall sound is really good. Awesome riffs too, groovy as hell
 
I agree with the above statement. i really love the riffs, the drums kinda go on a lot on the same patterns in some ares, try mixing them up just a little bit I dunno? turn up the guitars a little bit, give them a bit more mid, less highs and you should see a largs improvement in the "mass" of your mix without having it be too muddy! I love it though man keep up the good work!