Wow, this Broly might be even power then DBM's Broly. OK I exaggerated a bit (or maybe not depending on Malik's response )... I would guess his PWRLVL would be around Super Gogeta (battle of gods). or 10x weaker then him.
There's really no way to tell. Broly is just a power hound and giving him ssj3 is just hax. If I had to make an educated guess just based on his power in comparison to Goku and Vegeta when he's a normal LSSJ vs their SSJ, he's likely as strong as Super Buu, maybe even Super Buutenks.
thanks, like I said I exaggerated but your work is awesome. and I'm working on my working on my art skills for DBZ style art and regular art. (really hope to draw this well before my b-day unlikely though, maybe)