Remember, cross-stitch is considered counted embroidery.
So count count count count again and double check your counting. It really helps minimize mistakes.
Gridding save you a lot of time (and your sanity too). Cross stitch is meant to be relaxing. Make your hobby hugely beneficial for your mental and physical health.
Material Type: Aida Generic White
Sewing Count: 14/inch or 55/100mm
Design Size: 150 x 110 stitches
Sewn Design Size: 10.7 x 7.9 inches or 272 x 200 mm
Suggested Material Size: 16.6 x 13.8 inches or 422 x 350 mm
Stitch Style: Cross-stitch Using 2 strands