First off, this is heading in the right direction and I think you're making good progress.
All of this stuff following is hopefully useful critique to help you get that last mile; I'm not anything like as expert about firearms as Harry is, nor do I know period weapons of that time well, so on specifics about mechanical issues and how that would affect the piece, you can take my words with as many grains of salt as you want
Anyhow, I agree with Harry; the scratches are a bit indeterminate and the normalmap is still feeling a bit flat in spots. The big issue is the barrel; those big scratches would have taken rubbing up against stone or really banging it on things, which is exactly what you don't want to do with the barrel of a firearm.
Wear on the handle needs looking at; it and the cylinder are the two parts of the revolver that might have seen a lot of rubbing from hands, depending on who was using it and situationally. It looks like a photo-tex was used a bit there, which is OK, but keep in mind the context. The cylinder would get some subtle staining and edge wear over time if the weapon was used a lot.
If it was holstered with a flap and used primarily as a symbol of rank, it should be fairly pristine except where it got gently rubbed by the holster while walking or riding, with some minor wear from being used to practice with.
If in an open holster with a user who liked to keep his hand on the weapon, it might show more wear. If used in combat, it really might depend. But, generally speaking, you don't carry a revolver constantly in your hand; it's not like a rifle, where you carry it all day.
OK, on to more specifics about metal wear. Here we're talking about how use and function influence patterns of wear. This is a fairly complicated topic, it generally helps to know how a thing is being used (or imagine it fairly carefully).
Guns require more subtlety than swords. They aren't generally used to bash people with, they don't work well if you bring them in contact with the ground a lot, they have a tendency to injure or kill the user if mistreated. Don't get me wrong, I love distressed firearms ala the Fallout stuff and I love entropy in general
But for a historical piece in a historical setting, it's probably better to stick closer to reality, that's also what you want for portfolio. A fantasy firearm can freely ignore a lot of reality and engage in Mad Max tropes, so, eh, give us a Jin Roh-esque souped-up MG42 or
a 4-barreled naval pistol- oops, that was real
For a good reference of a well-worn Webley, it's actually pretty easy to find; I don't know anything about the weapon other than it being fairly famous, but it was obviously popular and had a lot of minor variations in form. Surprisingly, Wikipedia's example was rather decent, and really shows some specifics of wear:
So, we have:
1. The brownish marks in the grip patterns, which is hand gunk that never quite got removed because it got into pores in the material.
2. Close-up shots of the cylinder; I don't know what example you used as a reference, but this is totally different in terms of marks. Main thing though is the subtle patina where hands wore the finish off, both on the front and rear; if you're not sure about how or why because you've never operated a revolver, watch some Youtube of somebody loading one, it'll give you clues as to what's happening and deeper insight.
3. Fine lines and scratching on the mechanical parts, with more distress where the parts stick out- that part where the cylinder comes out, for example, with a big highlight.
4. More wear on the barrel tip, because it would rub against the holster a lot.
5. Browning on the trigger and the hammer, because both would be exposed to a lot more sweat and mildly oxidized even if taken care of.
6. Tool-marks on the two bigger screws that form part of the cylinder release system; again I don't know enough about the Webley to give an assured answer, but I suspect those two screws must come out to do a field-strip. Note that the other screws are nearly pristine; they probably only got removed if the weapon got stripped to components (which, with a revolver, would have been rarely).
Anyhow, hope that's helpful, you're getting pretty close there