Paint something like this:
Then apply a Gaussian blur to blend about 50 of radius
Step 48 – Layer mode
Change layer mode to soft light and reduce the opacity to 60%
Step 49 – Orange
Add a new layer and with an orange tone fill the layer with the Paint bucket tool.
Use the layer in soft light mode with 65% of opacity
Step 51 – Color Lookup
Go to the menu create new fill or adjustment layer on the bottom of the layer’s and then select the option “color Lookup” select the option film stock reduce the opacity to 25% and the fill to 65%
Color Lookup is only available at the cs6 or cc version of Photoshop.
Then use another color lookup this time tealorangepluscontrast. With 50% of opacity and 50% of fill.
Step 52 – Curves
If you don’t have that version of Photoshop you can use curves, the result is very similar. And that’s it.