Preferably two, one melee and one ranged.
I'd choose to have a combat knife with a short blade, no longer than 6 inches. If in a post-apocalyptic environment, (this IS fictional after all, as I'd NEVER make a 'great warrior' in RL), it would be a file of a similar length (for it's grade of steel), sharpened along both edges knocked into something solid for a handle ... wickedly sharp and nasty, with a good 'force to tissue resistance' ratio.
A sniper rifle or decent calibre rifle of any description, but a long rifle rather than a handgun. Ex military obviously or scavenged from a rural holdings where the weapons are 'tools' not toys. Telescopic sights maybeee ... for low light (try open sights at night!).
Not particularly majestic or 'great warrior', but assuming the idea is to survive ...
If it's just for the photo shoot, a Daedric, Elven, or glass claymore from Oblivion would catch the light nicely.