That looks like a balanced rig to me. To really improve it you should build an entire new system.
As you may have read numerous times here, AH3 is more dependent on the video card than AH2. The same is true to many other current games, too. Your GTX 950 is a mid class video card so upgrading that would allow for more eye candy and better frame rates in crowded situations.
However, and this is VERY important: If you get a more powerful video card such as a GTX 970 or 980, or their upgraded versions 1070 and 1080, you'd need a more powerful power supply with appropriate power connectors. Also notice that upgrading your video card may cause your processor become a bottleneck.