READFIELD — Sherri Jewell opened her new store, Jewell’s Market, this month, looking forward to summer and eager to put her new entrepreneurship skills to work. Jewell’s Market, with a large sign featuring her original logo of a girl wearing a pizza skirt, is located in the former Maranacook Market on Route 17 at the railroad crossing. “It’s been two hard months of work,” said Jewell, who pictures a few picnic tables outside and already has large planters and small helium balloons adorning an island that formerly had fuel pumps.