Its the cover art for Quillerys newest fanfic, Hold Your Color, which soon to be released. Its essentially something of a loose sequel to Dreams and Disasters.
“Before the Network, there was the Fleet. Before Diplomacy, there were Soldiers! Our influence stopped the Changelings, but before that, we held the line. Our influence stopped King Sombra, but before that, we held the line. Our influence will stop Tirek, in the battle today, we will hold the line!”
…then tiarawhy…
There’s nothing more adorable than ponies trying to look badass.
To be blunt, I find the fanfic community quite insular, so I doubt many readers would get it.