Sit the plush down to check the positioning of the tail (and make sure the tail helps it balance sitting, not hinders). Sew with upholstery thread (furniture grade) for a strong hold. Use water soluble pen or chalk to draw the 1/8" seam allowance line if needed.
♥ More videos in my How to Make Plush series: / teacuplion
☕ Full site, portfolio, and sewing tutorials: www.teacuplion.com
♥ Plush sewing patterns: https://www.etsy.com/shop/TeacupLion