Great first armor build, Mike!
I see a lot of technical errors in the build, but nothing wrong with your skills in painting and finishing.
A little TET will rid the decal silvering, so that's an easy fix. As far as touch ups go, the Army did a lot of that as routine maintenence, so that's authentic.
Tracks backwards? Everyone makes that mistake lol.
The searchlight covers had plywood in the face to keep anything from contacting the lense. The cover should be flat in front.
The front drivers periscope would be down if his head was out of the hatch. Otherwise it blocks his vision.
The spare track links were attached to the turret rails with the center guide tooth. Yours is upside down - tie it on with some string and you'll be okay.
The radio antennae is in the righ place. There is a second one behind the TC's cupola for the second radio set that talks to command. Only the lead tank would have one.
You have the tank marked with Army markings but as far as I know only Marine units has the -A3's. The Army had -A2's A2C's and a few old converted -A1's. The main differences being the addition of the cupola riser and the two extra return rollers on the -A3's. The few converted -A1's had five rollers as well, but the -A2's only had three per side.
Lile I stated above, mostly just technical errors. Nothing but hours and hours of research would've prepared you for all of that lol. Those are just the things that an Armor Nut can see and the Tamiya instructions don't point any of that out. Not your fault in the least.
Overall I think you have a solid display piece and I don't recommend you changing anything but the decal silvering. 99% of those who view this model won't know what's technically wrong with it and won't care anyways.
Your painting and weathering are solid! I really hope you'll try another armor kit, and soon! :D
Just for the record, this is a very good build, Mike. Don't let the technical stuff bother you. You did great!