Help on fitting polo shirt

Hello. A beginner here. I need advice on this polo. This is a pattern I have made myself based on my own measurements and following the typical drafting procedure. Please have a look at the photo of the light blue polo and see what you think is the problem with it. Yes .. I don’t have the perfect athletic body shape but the polo, sweaters I buy in the shop fit me ok. So what did I do wrong? Could it be be the armscye curvature be too shallow? I mean the curvature going deep into the chest, not the hight of the armhole, that seems fine. This is just scrap fabric it’s a no-stretch mid-weight polyester. The shoulder length is fine. The armhole height is half of my schy measurement plus 2 cm or 1 inch I can’t remember right now. The chest size is fine, with 8 cm/

3 inch of ease. Thank you in advance for your help.