Direct sunlight is enough to soften the glues in your acoustic guitar, which will weaken or destroy the joints and destroy it. Do not display your guitar anywhere that will be exposed to the sun even as the light moves across your room during the day....
You need to get a proper microphone. Most people just use the voice mic that's provided where they are playing and that works, but they don't give you the quality you need. Condenser cardioid unidirectional mics with a small diaphragm & flat frequency response are best for close miking of your guitar because they have less bass boost than other directional types when placed close to the guitar.
If you are only going to use one mic ?? position it as follows:
Position the mic between the sound hole and the edge of the guitar body approximately 3 inches away to start off with. This helps in finger style and quiet playing great. You can hear all the harmonics and nuances. If you need to play louder or adjust volume, back off to about 6 to 8 inches. You can experiment to see what you like personally. Well, to get more bass, bring the sound hole a little closer to the mic. Depending on the set up, you may experience feed back when you do this so be careful with the sound hole thing.
If you have the two identical mics? then place one at the 12th fret and another by the bridge. If you mic for instance 5 inches from the guitar, the mics should be 15 inches apart.