Bob;
VERY nice job indeed!
I sympathize with you on the oft-times meager responses of stuff posted here. "Tell me all about it"! I fully agree with the idea and desirability of getting good "/review and comment and critique and suggestions".
That aside, here I go! :
1) I love the camo - hand-brushing was very effective for this scheme, and yes, it could well have been originally done just that way (begs the question, maybe, but as this was a sort of refurb conversion vehicle using what I believe to have been recovered Pz. III, it seems probable that these may not have had the air-compressor and spray-gun included as OEM equipment, as seen on later Pz. IV and Panthers and Tigers I and II. So the crew may well not have had the easy option to spray their camo!)
Anyway, the camo is GREAT.
2) I like the weathering a lot - looks properly dirty but excessively so. While pics do show tanks covered in mud, these were not the majority. So, IMO, this is GOOD!
3) Others have noted some details - flame-cut edges, etc. By me... OK, but perhaps a little too sharp. My impression from photos is that this effect is not all that apparent, but of course just my opinion. It IS certainly more interesting and perhaps "accurate" than a smooth, clean edge on plates that did not have such edges (I'm accepting here that these plates were indeed somewhat roughly-finished, as compared to factory-built production tanks).
3) The tracks (runs and links in spare-mounts) are all fine, IMHO. I am a fan of Magics and think that they do really look pretty nice in almost every case. Looks like you drilled out some pin-holes in the spares - always a neat touch and something I routinely do, as well.
4) Running gear looks pretty good. I, too, am a fan of chipping and cracking the rubber tires. I do think you may have been a bit aggressive in this and could have had some more gradation in the wear - some of those divits look pretty substantial, to me!

But it's only an opinion - wear is good. What could make that pop a bit is to "wear" most or all-but-one wheels, and have one which looks new and "shiny" as the replacement. This could, for interest (and another question begged, I suspect!) be reciprocated in the spares mount - having one be a routine spare, even "included" in the crew-applied camo (as often appears the case in photos), and the other maybe the old wheel re-stored after being swapped (the begged question here being whether crew were instructed to return used wheels for rebuilding...). The swap-over used condition may include some lingering mud on the old wheel... Just an idea for a future build
5) Where the ball dropped, IMHO...: a) that bucket. Looks unused and rather out-of-scale a bit (maybe it's an extra from a Tamiya kit?) - buckets were used for painting and for washing vehicles and maybe even for changing oil. Most appear dented and very mottled with stuff, far as I see. Your bucket also has a very evident and prominent punch-out pad inside. And it's bottom rim needs real thinning to get the tinny bucket look. b) you jack-block. Blah, IMHO. Blocks were made of wood pieces wrapped with metal bands. Yours looks like it has metal caps. Not likely, I think. I know that these bits seldom have end-detail molded on - a common failing even in the best kits. EASY to score in some detailing. Also, I cannot see how it is being held or mounted there. Options include a tray mount, strapping, one or more bolts through with wing-nuts. Looks out of keeping with your otherwise great job. Again, JUST my opinions!

All up, it's very cool and I wouldn't mind having such a build on my shelf!
Thanks for posting this, and yes, very good to see someone actually punt out here some feeling and statement for how we are largely not using our site as well as we can be! "Hear, hear, Sir!"
Bob