>>2683179Learn to use RGB curves.
After inverting a colour neg scan, you're almost always going to want to drag a shitload of blue out of it. You're probably going to want to add a bit of red in the top half to give people human-ish skin tones. And then very subtle adjustments to the green to balance out out likely slightly too red skin and too green underexposed areas. Green tends to have the biggest impact on your global contrast as well, hence doing it last and least.
Pic related is a normal first adjustment to get things in the ballpark.
But first your scans need to be properly white balanced, yours was a joke.