From Source:
"It aint easy being a Pink Pony in a Green hell"

You ever sit down and think; "What if Pinkie Pie was part of the special forces during the Vietnam war?"

And then you are hit with the realisation that you are an artist and can make this idea into a reality, so you gather your reference and start drawing.

Of course!-
You could also ask a machine/clanker/ai to generate this idea for you.. But what if you specifically want Pinkie Pie to wear Tiger Stripe Camouflage Headband/Pants, matched with a period accurate olive T-shirt? What if you want her to carry a 100% technically accurate M60 machine gun missing a bipod on the right side? What if she got hit and has a bandage specifically on her left arm, and a piece of her left ear missing? What if you want her expression to be a combination of tired and confident at the same time? What if you want her to have 100% anatomically correct hands/fingers doing a sign of the horns symbol? Rock On Pinkie!