This is very good! Her pose on the surfboard looks great, from how she's sitting to how she's scratching her head in pain, and I really like just how detailed all the shading on her body is. Her boobs look great as well, and I love how they're hanging here, it looks really natural and nice. And her expression going from confused/hurt to pure embarrassment looks great, and Akko's own expression and smile look really nice too, and I like how you can tell how busty Akko is even from just a bubble, and her blush make her just look very cute. Only criticisms I have here are that I think some her right thigh is a bit to big in comparison to her other one, and her hand looks a little small, but everything else about this drawing is excellent. Overall, thank you for all the effort you put into this request, Tmimi.