Maguire has been on loan at the League Two club for most of the season, and Bell is keen to help the 20-year-old make improvements to his game.
The Accrington assistant believes that Magiure wastes too much time pondering in front of goal and he wants him to start being more ruthless.
“I spoke to Sean, I think he dilly-dallies a bit in front of goal and I said, ‘You don’t get that time and space, you’ve got to be one touch in the box, maximum two’," Bell said.
“He seems to want to score that perfect goal. But he’ll have a little think about himself and where he wants to go."
Maguire scored for the first time in three months at the weekend, when he netted during Accrington's 2-2 draw with York City.
It should be a big confidence boost for the youngster who has had to endure the toughest spell of his career to date of late.
Maguire will now be hoping to kick on and continue to hit the back of the net until the end of the season.
His first taste of regular senior football in England has been fairly productive, but he is likely to need to do more if he is to convince Sam Allardyce that he has a future at the Boleyn Ground.