I suspect he means that the dirt build-up effect in the panel lines looks too uniform.
Most of the photos of 109s that I have show fairly sharp panel line relief on the fuselage (as opposed to 190s which were relatively light), so I don't think you're too far off the mark with them but I see what he means. The panel lines are quite sharp. It is most evident on the light blue and white areas of the fuselage, I think, where the contrast makes the panel lines look too deep or really really dirty. I noticed the same thing on your 190 A6 too. Clearly you have more experience with these sort of things but I try to soften the panel lines a little in areas where the paint is lighter. The contrast is so extreme that the effect becomes overpowering. I find that whilst a certain panel line opacity looks perfect on darker greys and greens it needs to be a little lighter in areas with lighter colours. I just spray a little of the base colour (RLM 76 for example) over the offending panel lines. I find that this achieves a slightly more consistant effect as far as the perception of the depth of the panel lines goes.
That's just what I prefer, though. I do like your subtle rivets, nice and accurate.
One other thing, while I'm at it, I don't think I've ever seen the dirt build up on the main gear covers like that. Ignore me if you've seen something like that but I don't recall ever seeing anything that severe even on really dirty 109s. Maybe mud spattering and caking on the lower sections but never sharp panel line build up.
Nice work, as always, Fencer.