RS is super accurate stuff and it looks like you did a good job putting it together so I imagine you’ll be just dandy with basic 501st approval, I would tighten up that belt so it sits correctly before sending off photographs though.
That said, it comes down to fitnent issues. Belt as you’ve already mentioned,but also:
- You can easily pull your forearms down a good 30-40mm toward your hands, there is a huge gap there. This will also give you more space between your forearms and biceps which will help with movement, especially things like being able to put on and remove your bucket unassisted.
- Also, your right forearm appears to be rotating outward. A simple strapping tweak should fix that.
- For best appearance (and EIB/Centurion) you’ll want to get those shoulder bells pulled in closer to your bridges, shortening the attaching straps should do the trick. Film reference:
(You can also see correct belt positioning here, top of belt should touch bottom button of ab plate.)
- Your posterior is overlapping your thighs quite a bit, this may impact movement and/or create unwanted noises while trooping.
- There appears to be a seam where you’ve shimmed your kidney plate to close up the gap on the left, this will need to be filled in with ABS paste and polished out for Centurion only.
Again, great job on your build.