Competencia Flying shell?
https://www.etsy.com/listing/476601080/seek-and-destroy-tee-mario-kart-t-shirt
https://www.etsy.com/listing/1660567520/new-minimalist-shells-trio-heavy-weight
https://www.etsy.com/listing/652654116/blue-shell-suprise-btch-t-shirt-spiney
https://www.etsy.com/listing/1364661759/flying-shell-digital-cut-files-cricut
https://www.etsy.com/listing/1769550737/shell-svg-blue-koopa-shell-of-super
Good listing examples
- https://www.etsy.com/listing/1750003210/super-mario-star-shirt-pocket-mario
- https://www.etsy.com/listing/1623206863/queen-of-hearts-embroidery-t-shirt
- https://www.etsy.com/listing/1072375488/hokusai-oversized-t-shirt-embroidered
- https://www.etsy.com/listing/1681790974/best-buds-embroidered-sweatshirt-420
- https://www.etsy.com/listing/1721918864/embroidered-t-shirt-unisex-charlie-the
- https://www.etsy.com/listing/1463508222/custom-dog-portrait-embroidered
Easy to improve
- https://www.etsy.com/listing/1683166483/custom-embroidered-t-shirt
- https://www.etsy.com/listing/1742039779/embroidered-t-shirt-manga-anime-unisex
Star
- https://www.etsy.com/listing/1750003210/super-mario-star-shirt-pocket-mario
- https://www.etsy.com/listing/1458300071/personalized-mario-bros-family-shirt
Store Examples
- https://www.etsy.com/shop/FOXEMY
- https://www.etsy.com/shop/shethedevil
- https://www.etsy.com/shop/MomsCanFly
Stolen designs
- https://www.reddit.com/r/EtsySellers/comments/1frg8el/think_before_you_sell_that_tshirt_you_bought_an/
- https://www.reddit.com/r/EtsySellers/comments/16j9462/is_there_a_way_to_see_etsy_sales_stats/