As others suggested, check those tailights. I think getting xenons might be pointlessly expensive, for looks only - go for LCI halogens that have angel eyes. It's a direct plug and play and cheaper than 500 bucks.
For your photos, next time:
1. take pics in a way that sun is hitting side of your car, not directly above (so hour or two before or after sunset) or in shade
2. reposition the car for pics - obviously since you want the light right
no need for tripod with an iphone which has a decent point and shoot camera actually.
If you have a montego, compare it to mine from side. I have light hitting from side, which makes a big difference on how color appears.
'07 TiAg BMW Z4 Coupe 3.0si / Everything