I am making the medium but increasing the hook size to 7.00/mm. I tend to crochet tight.
I went to row 53 before starting the neckline/dc rows
I controlled the colors only at the top: magenta, pink and orange so it would be same on front and back. I also controlled colors on the sleeves, with the yellow following the pattern and then switched to white for the rows I added
I left approx. 8” opening for sleeves
I seamed down side and left approx. 8-1/2” open at the bottom

Sleeves
I followed the sleeve directions as written with these numbers:
48 st around opening
12 hdc, 24 dc, 12 hdc
8 hdc, 32 dc, 8 hdc
6 hdc, 36 dc, 6 hdc

I then added these rows:
hdc2tog, 4 hdc, 36 dc, 4 hdc, hdc2tog
hdc2tog, 3 hdc, 36 dc, 3 hdc, hdc2tog
sc around (44)
hdc around (44)
sc in 3rd loop around (44)