Rather then taking a photo of him free-running can you get someone to hold him stretched out in a 'show pose' that way you will get a non blurred photo that will show markings and head.
No one can guarantee a show win - not even a breeder - so I think that question is not one anyone can answer for you.
Cats are judged on the day against other cats and the one that wins is the one that is closest to the breed standard, but there is also an element of judge preference so it could depend on who is judging also.
The main things I think in regards to showing are - no tail faults - ie no kinks in the tail and its not long thin and whippy.
The ears are medium size - rounded tips and set well on the head - ie not straight up, pointed big bat ears.
There are no lockets - ie white/grey patches anywhere on the body (this doesn't include a whited tummy or white whisker pads/chin) - check for these around the neck area or on the tummy usually.
The profile ie nose bridge - needs to be straight or with a slight curve to it, not indented or dipped.
The coat needs to be clear and a good contrast ie if a brown Bengal the markings need to stand out so the blacker the better. No vertical lines by the rib - but its very difficult not to have at least one.
If Marble the pattern is liked to be open and have a horizontal flow to it and no bullseye.
The bite needs to be level first and foremost in regards to the mouth - the chin shouldnt fall away.
Those are the main things - when you are looking at your cat try to be subjective about what you are looking at - and then you can decide if you think its worth a shot. Personally unless there are any major faults, ie locket, kink in tail, under or overshot jaw then I think its worth a go.
And the most important thing - TEMPERAMENT