Someone mentioned the date window at 4:30. I agree to that. In general, the date window topic is a quite important one in relation to the dial's design overall balance. Intrinsically, a watch dial has a strong symmetrical dynamic, everything stems from the center and the (mostly) circular design will require careful efforts in "placing" all elements. If you decide to put an asymmetrical component to it (which is absolutely fine) then, in my view, the overall design will need to be clean and a clear statement, not cluttered. A seconds subdial at 7:30 for instance is fine for me as long as there are no other elements driving your eyes everywhere else. A tiny datewindow at 4:30 doesn't fulfil this design requirement, imo. It just distracts attention and its dimension hasn't enough "gravitational force" to be a meaningful element of the design, it will mostly ruin the design's balance.
A classic datewindow at 3 will work for me if it's either subtle (datewheel color same as dial) or counterbalanced on the other side (dateweheel color same - white - as index at 9 o' clock). What really disturbs me are datewheel colors that don't match the dial or index color.
There may very well be exceptions to this and nuances that will affect overall design, but I'm just thinking out loud and in general terms.
