I think they are fine but, If it was my model This is what I would do,

I would take my airbrush, Get some of that black in my colour cup, add maybe 2 drops of white in there so it would look like a say NATO black.

I would pick out some of the panels at random maybe mask them and hit them with that different shade of black just to break it up a bit.

The wheel wells I would make sure they were sealed up with a semigloss sealer or future, and either use a wash product or mix some browny/black enamel with thinner.

  We're talkin 75 thinner-25paint and give it a complete wash or just some touches. I'd dull up the tires a bit too.

Please! that is only what I would do, your'e model looks awesome! Weathering and touches are a matter of taste. Not all aircraft are the same, have been used in the same enviroment or have all their original parts. Youre attention to detail and care are evident in your SR-71, again nice save! Now I want to build one.