The mirror is a thing that leadership the water. The direction of North is Zone of water. So the best place of mirror is a Beauty Parlour. A Beauty Parlour suitable place is North East corner and facing West and North West corner. Facing East because your shop is North facing. Your shop's shape is rectangular so it is suitable for business. Beside the South wall bathroom is also good for you.
For success in your business you should care the given following Vastu tips :
1) Pooja place should be at North East corner.
2) Electric metre, board and other material should be at South East corner.
3) Cash box at South Weest and rack should be at Eastern and Western wall.