Open your drawing up into Photoshop, pretty sure this works with all versions, BUT DON’T QUOTE ME ON THAT. KDSNlgd.
Click your first layer, scroll down and click your last layer while holding shift (that’ll select all of them, duh Homi).
Right click and select the option “Merge Layers”. Also works with “Merge Visible”. “Flatten Image” though, does not, unless you have a background or don’t care much for transparent backgrounds.
Right click and duplicate the layer.
I usually keep the radius around 3-4, but you can do whatever.
Click the layer mode of “Layer 2” and select Soft Light.
THERE! YOU DONE! SOFT AND SHINY AND SATURATED AND AWESOME! (It’s really easy too.)
Hope it’s easy enough to understand!