Not bad but unless it’s made of latex, it’s too tight.

Adding creases roughly by using curved rounded segment protruding from the sides of the sleeves then detailing if necessary can help.

Clothing is difficult so different references should be used. So long as it fairly relates to the reference and the current angle and position, it should hold out.

Aside from detailing just increasing the thickness of the sleeve as an additional step would be wise to add.