These photos seem to have the same technique. It looks like some split toning, cross-processing, and something else. The first one I have no idea. The second one, maybe some cross-processing. The photographer also does something else, but I can't put my finger on it. The third one, split toning or color manipulation perhaps? Any insight helps. Thank you! 
Madness Photography
https://scontent-b-pao.xx.fbcdn.net/...79052731_n.jpg
Michelle Katiussa
https://scontent-b-pao.xx.fbcdn.net/...71687127_n.jpg
My Mental Media
mymemedia1.jpg

Madness Photography
https://scontent-b-pao.xx.fbcdn.net/...79052731_n.jpg
Michelle Katiussa
https://scontent-b-pao.xx.fbcdn.net/...71687127_n.jpg
My Mental Media
mymemedia1.jpg
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