I like the way you use chords and mix styles (in Guitar Wars). It’s two beautiful compostions and very rich arrangements with good ideas.
However, I think the mixes need to be better done.
Volume balance in Guitar Wars can be improve. The guitars are too loud and harsh. The snare is a bit too quiet in the back. Try not too have all your guitars peaking in the same place in the frequency spectrum (it sounds confuse and messy because you have 2-3 guitars playing at same time all different part and all fighting each other around 2000-3000 hz).
The biggest problem in Rolling Hills is that for an orchestra track, all is way too dry. Do you use reverb? It needs to sound open so you need reverb and more brightness on many of your instruments. It sounds harsh too much 2000-3000 hz and too many instruments loud here. Your french horns could sit well somewhere around 300-500 hz over the acoustic guitar and e. piano. It would let the place for your higher instruments in the hi mid area. Yet your hi staccato strings need more treble, they are very harsh (telephone like) and muffled. With more treble they would have openess and crispiness they need in the context. To me, the hi strings long notes should be the brightest element in your mix (place them more in the treble area than the others). Watch out to not make them too tiny. I personnally always start by eq bass instruments, after low mid etc to not finish with a tiny/harsh sounding mix. Take break between sessions. I personnally work on many projects at the same time and go from one to the other to keep my objectivity.
Cut what you don’t need, keep just what is needed in each instrument. It will let the place for the others.
I hope it helps! Again very nice and interesting music.