I cannot show you my first camouflaged tank ever but -believe me- it was not that good at all.
This is one important step for a military modeller, so I guess you will enjoy more your paintiworks from now on. Now just have a good time on the weathering of the beast.
I am not one expert and may be wrong, but the only tatra fire extingisher painted red I have seen so far is NOT the type depicted in the Tamiya kit. That one I would paint it dark yellow or light greenish-grey.