I can't believe an MCB M3 has been for sale since August! I think the price is pretty fair too. If I was in the market for an E90, there's no doubt in my mind I'd go with an Individual color over a standard one.
I guess the only thing I can say is to take way more pictures. Engine bay, rear seats ect... That surely can't hurt. Good luck to you! So sad to see her go.
P.S. I think you should keep it
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Current:
16 F82 M4 GTS, Black Sapphire/Black, DCT
08 E92 M3, Sparkling Graphite/Bamboo Beige, 6MT
07 E85 Z4M Roadster, Alpine White/Red, 6MT
99 E36 M3, Techno Violet/Dove Grey, 6MT