I agree, the highlights are done. Maybe put some lowlights in, panel lines do not specifically exist, at least like on aircraft, but shadows and places hidden from the bleaching desert sun do.Those highlights look to me to be about right. I wouldn't want to overdo it, to avoid the model looking too, well, painted.
Looking good AndyAn update while the second layer of weathering is drying. This time with a pale yellow oil wash.
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Tamiya decals are always thick...