Nice! The adjustable sights, beavertail, and magwell are lifesavers, and it looks like you've already got the extended mag release (maybe?) and a lightweight hammer.
My only suggestions would be:
Polymer or aluminum frame trigger - although it looks like you've already got a frame trigger, not sure what material it's made of.
Compensator bushing (takes my group size down from 9" to 5" at 25 yards)
Aftermarket guide rod (makes it a LOT easier to field strip)
Polish the feed ramp until it shines. Stock 1911s have a tendency to FTF with non-target ammo, and polishing helps.