The Baggies came from behind to claim a 1-1 draw against Liverpool at the weekend, and Foster has been impressed by the Spaniard's "winning mentality".
"Pepe Mel has brought a lot of confidence back in," he told the club's official website. "Training is bright and lively and I think, apart from the first half here which was a bit dull, the second half was more like us.
"We're a lot more attacking now. Today was a better balance. It was probably a bit too gung-ho against Villa. It was end-to-end football and I don't think that's our style of play.
"But in the second half, when we go to attack, everyone goes for it. He has a winning mentality. He doesn't want to draw. He wants to go and win football matches, that's for sure."
West Brom are currently 16th in the Premier League table.