Find tools and images online to help you draw the female form. These can be purely poses or images of women in real life. A beginning artist might draw the female body in standing poses, while a better challenge is to draw them bending over or sitting and participating in natural forms of recreation. Find drawing aids to help create realistic examples of the ideal female life drawing.
The female body can be very beautiful but also very complex, especially when portraying older women faithfully. To demonstrate the body in its natural proportions takes both practice and visual examples to be based upon. There are also ratios to remember when filling out the human form, but nothing beats drawing from a realistic example. Find the visual aids you need online or download references from a useful website that is trusted by artists.