Cute, simple colours.
01 • Take your base then crop it.
02 • Duplicate your base and set to screen, set it at opacity 50%.
03 • New layer, then fill it with #011a33 set at exclusion at 100% opacity.
04 • New layer, fill with #ffffff set at Multiply at 100% opacity.
05 • Layer > New Adjustment Layer > Color Balance.
Shadows
Color levels : -60, -20, 30.
Mid tones
Color levels : 20, 5, -10.
Highlights
Color levels : 12, 5, 13.
06 • Layer > New Adjustment Layer > Curves.
RGB
Click 1
input: 63
output: 70
Red
Click 1
input: 155
output: 138
Click 2
input: 32
output: 13
Green
Click 1
input: 72
output: 79
Blue
Click 1
input: 181
output: 190
Click 2
input: 52
output: 70
07 • New layer, fill with #eff887 set at Soft Light at 20% opacity.
08 • Layer > New Adjustment Layer > Selective Color.
Cyans: -100
Magenta: 0
Yellow: -74
Black: +59
Yellows
Cyans: -100
Magenta: 0
Yellow: +60
Blacks: +23
Neutrals
Cyans: +82
Magenta: -8
Yellow: -13
Blacks: 0
Set layer to normal at 80%
09 • Layer > New Adjustment Layer > Hue/Saturation.
Cyans: 0, +30, -30
10 • Duplicate your base, drag it to the top and set it as Soft Light.
11 • Duplicate the layer you just dragged up and set it to screen.
[this was a VERY bad explanation, but I'm quite lazy. any questions, just comment.]