his ears look a little large at the mo, but it's a delicate subject with bengals. i've seen some with HUGE ears in the show ring that have won rosettes. also, they go through different growth spurts, so he may well grow into those ears as the rest of him catches up.
the best way to know if they are show quality is to take the plunge & enter one. go just for fun with no expectations & you may be pleasantly surprised. it's also a good opportunity to compare him to others.
the most important thing is temperament, as unfortunately there is still a lot of prejudice towards the bengals' wild ancestry in the show world. again, you won't know whether his temperament is good enough for showing until you go to one...they can change so much in the show environment as it is so different for them.
give it a go