I just had a quick look at your motor, and I would say I'm sure the pics don't do it justice... Also there is no mention of any cambelt history, which would be the first thing I would want to see.
Also no reason for sale? I would be asking myself if you've only had the car for three months wht are you selling it? Then as a "punter" I'm thinking something like a cambelt or other major expense is looming, or that it is to expensive to run Or any other number of things, few of them desirable in a car
BTW I like all the mods and the colour , those wheels are spot on, so very very Alfa, and the interior looks so much better than the two tone ones.
Only thing is a 2.5 is so much cheaper, and while the GTA is a fantastic motor you could get two or three 2.5's for that money, and fuel is only going up in price.
This car (and any GTA tbh) will become an appreaciating classic in time to come, and I reckon the market is as a play thing for a diehard Alfa nut who drives a diesel everyday and wants to hear that stunning V6 on the weekend
Anyway good luck with the sale