if you wanted to take it to the extreme and go for it, you could just take the one picture where the brand of the respective mixer is not shown - so there would be no direct connection to those mixers here
just like i said earlier - it's a gray area here imo

i really don't want to give the impression that i really want these free raffles (i don't organize them anyway)
it should just be made clear here for the operators/organizers