Please, no. Being on the New Lunar Republic's side is fine, despite the foolishness many of it's members possess, but having an ideal of killing Celestia is downright ridiculous. You are clearly on the more extreme side of things. It sounds like you are simply a worshipper of Nightmare moon, who is an entirely different pony from Luna. You see, it was Nightmare moon who wanted eternal night, not Luna. It was Nightmare moon who wanted to kill her own sister, not Luna.
Sadly, most Lunar Republicans do act like this, so I warn you all who are neutral, or those like me who side with the Solar Empire. This pack of Nightmare moon loving extremists will resist most rational arguments. Most of them are ignorant to the fact that Princess Celestia is in fact NOT a tyrant. She is calm, kind, and wise, do not let any Lunar Republican convince you otherwise.
Me as a pony knight: *Sees the poster and thinks to himself*
"There are many evil forces that bide their time; making plans to conquer or even destroy our peaceful and glorious kingdom of Canterlot. Whenever they plan to strike, my allies and I will meet them on the battlefield, and we will rally together with an army so large, and so powerful, that nothing will stand in our way, not even the Four Ponies of the Apocalypse themselves. We will charge at our enemies with feelings of honor and bravery in our hearts and minds, knowing that a day will come when Equestria will forever be a land of peace, never again to be tormented by the looming shadows of evil. We will charge with a magnificent battle cry that will make our foes cower in fear.
Is this in the same 'world' as that comic you did where Celestia and the Element bearers vanished performing some kind of attack in a war with Griffons, leaving Luna the sole ruler of Equestria? Because if it is, it strikes me as super sad that Luna signed off on this propaganda. She misses her.
Better question, though: is all of your art in that same 'world'?