What you mean exactly by different tonalities?
In my eyes there are different colours of rust (in real life) and this depends on the type of metal that is corroding. Some of the normal carbon steel get tonalities of orange rush (as a superficial coating of rust) the longer it wets up, the darker it becomes, till the metal starts eroding, where the colour would normally be dark brown.
This is how my eyes see the rust colour, now I'm open to hear how others see it too, so that I can learn better how it is seen by others.
In these photos I now am seeing that I used too much orange and covered most of the brownish colour of the old rust so now I'm trying to correct it.
The streaks are getting better, trial after trial, at least I see them so
Thanks for the feedback I hope there will be more.