I plan to do vocals in the future when I decide to part money for a vocal mic. Until then I was planning on recording a few instrumentals with just acoustic guitar. rhythm and lead. should I be going about it in a different way for solo instrument?
My "rule of thumb" is that the lead voices get the first priority for audio spectrum. What you have sounds like a good rythm track, nice and punchy on the attack, and a bit thin in the body but with some bottom definition. That leaves those mid frequencies so that the lead voice gets room to do it's thing without getting tangled up in the guitar. You may be able to get a bit more "bigness" by panning the guitar sound slightly to one side, and putting duplicate performance (or a copy of this one with some reverb and/or delay on it) on the other side.
If you are using acoustic guitar as the lead instrument as well, you may need to get more of the mids "on tape" as it were. Without hearing the guitar live I have no idea how accurate the recording is, but if the guitar has a naturally "fuller" sound than that it may be your mics or mic placement. 12th fret is a good start for detail. You will get good balance of highs and resonance, natural fretting sounds (but not too much) and pick sounds. I usually stick a small diaphragm condenser there. The body around the bridge will tend to give you more of the "fullness" of the resonated notes. The sound hole tends to be "boomy". Too much so for my tastes, so I tend to avoid it but getting closer to it may help you in this case. I'd start by experimenting with mic placement. Maybe try one mic around where the fret board meets the sound hole or on the body, and the other three feet or so away with a little bit of extra gain. This may capture more of the resonated notes and a bit less of the high end.
You will definitely be trying to get a different sound texture for the lead voice, otherwise it will just compete with what you have. Some EQ boost in the Mids can help, but don't over do it or it will sound "unnatural" (unless that is what you are looking for, but I'm guessing it isn't). Maybe you can use another guitar that has a different voice? Maybe a Classical or just a different steel string with more body? You can also try different strings. I find that Ernie Ball Earthwoods give a fuller but less "in your face" sound. You'll lose some of that nice percussive crispness you have on the posted track though. That should keep you busy for a while along with some of the other advice offered so far!