The red oxide doesn't look too red to be primer to me. It's usually described as a brick red color. I'm assuming you are doing the Autumn scheme as suggested by Thomas Jentz, where the primer is the base color and the paint crew skips the Rotbraun paint as being redundant with the primer showing.
I think the Dunkelgelb could be a bit deeper, though it is one of those colors that looks quite saturated close up, but "reads" much lighter from a distance. The official RAL color chip was a tan color, though some surviving samples are indeed greenish. If you weather it, the precise colors won't really matter.
Some KIng Tigers with the Ambush Scheme had a lot more spots, looking absolutely polka-dotted--I suppose it depended on how much time the paint crew had to finish.
However, it does look like you've used the Dunkelgelb as the base color, which would be incorrect for that scheme. The Dunkelgelb would be a secondary color over the primer. Also, the post-September schemes were officially supposed to be hard-edged, though there may have been some exceptions.
I should mention that there are camouflage heretics in the modeling community, who believe that Jentz has misconstrued the painting orders, and maintain that all three original colors (Rotbraun, Olivgrun and Dunkelgelb) were used, completely covering the primer. They insist that the only change was that the whole tank wasn't painted with Dunkelgelb first--that the three colors were applied only where they were supposed to be visible, like a paint by numbers set. Rather than argue, I usually prefer to model the earlier and later schemes, and just skip the Autumn, 1944, period altogether.
Though too late for the Battle of the Bulge, the final scheme, overall Olivgrun with bands of Rotbraun and Dunkelgelb, was supposed to be introduced at the end of 1944, though factories had until March, 1945 to comply. From black and white photos, it's impossible to say exactly when Henschel made the switch, since a dark base color could be primer or Olivgrun (I suspect they adopted it quickly, since they switched to the previous scheme as soon as the orders went out in September, 1944). The Ambush Scheme spots occasionally reappeared in 1945 as well, but apparently that depended on how busy the Henschel paint shop was.
