Like many have said before me, when you get your hands dirty you’d probably appreciate the works many good people here have done. To you 
@gadolf thanks for the diapo, it is indeed a nice (what do the men with the stickers call it? ah yes) candid portrait. The composition is not bad at all, with the strong dark diagonal and the little crossing road following ala africain the rule of thirds. Their shadows got bored and are already leaving 'cause this princesses are not in a hurry whatsoever. I find it ironicaly balanced that the little one is all defiance and the older is but an open smile; heartwarming. The issue with the frame is that the ditch is dark and kind of menacing… who knows whas in there!! Regarding the conditions of the film, not also the emulsion is very deteriorated (the chemicals have long started their own hardcore crossprocessed style party), but there is plenty fungus and cracks and… well, you name it.
I did start (like I imagine most of the people) trying to bring a more natural “ambient” to this party of 2.
Of all the software I did choose Lightzone (an added reason was its healing tool) and it was actually doing a decent job till it decided to hang, display the 
and faint as ingraciously as possible. If you don’t know LZ, it doesn’t keep a sidecar of the editing, so… bye-bye
Edit >> as @jacal pointed out below LZ does / should save a
filename_lzn.jpg, containing the editing data in a jpeg preview (1048 px by default, can be bigger or full-sized, or tiff).
So trying not to get sucked into radicalisms, I asked myself this question: what is it the goal here?
The answer was pretty clear, also as my experience with gimp has been a mixed bag with some nasty surprises and I’ve used photoshop for over 20 years, went and did the zing in the later.
I washed a bit the dirt on the girls’ faces and just blured the rest a bit more, blured shit smells less my grandpa; I always took advices too literally. I stopped the colour processing at this point, since the start I knew the crop exactly and that was going to be B&W
And finally got here. Not redemptive at all, but I used photoflow (VIPS) resizing algo from CLI, probably the sharper I’ve ever seen (for some photos even too sharp)
photoflow.app/Contents/MacOS/photoflow --batch --export-opt=jpg_depth=8,jpg_compress=100,width="$1",height="$2",sharpen_enabled=1,sharpen_radius=0.5, profile_type=srgb,trc_type=linear "$f" ${f%.*}_phfrez.jpg
And voilá, I pray for dogmatics to find in their heart a way to forgive me, and ( contrary to how I normally do things and and how I relation myself with… well everybody else ) I do hope that you like it Gustavo.
Cheers
PS
@paperdigits did you take out the sun glasses? Yast messin wicha
ma!
The films were developed using certain processes, like E-6, used for Ektachrome, Fujichrome and other slide (colour reversal) films, or K-14 for Kodachrome, and so on.