Deliberately looking at a non-Mahram woman and continuing to look after a first accidental glance is prohibited. It is forbidden to look at any part of her body, whether you think she is beautiful or not, whether it provokes sexual desire or not, whether it is accompanied by evil thoughts or not, and whether it leads to immoral deeds or not.

Masturbation (for both men and women) is haram (forbidden) in Islam based on evidence from the Quran and the Sunnah. See the detailed answer for 13 tips on how to give up masturbation.