the user interface design for a hair style recommender:

Home page: This page should include a brief introduction to the hair style recommender and a prominent call-to-action button or form to start the recommendation process. The page can also include links to additional information, such as a FAQ section or a list of available hair styles.

Recommendation form: This form should allow the user to input their personal details, such as their gender, age, face shape, and hair type. The form should also include options for the user to select their desired hair length, style (e.g. formal, casual, etc.), and any additional preferences or constraints (e.g. low maintenance, suitable for work, etc.).

Recommendation results: After the user submits the recommendation form, the system should display a list of recommended hair styles that match the user's input criteria. Each recommended style should be accompanied by a visual representation (e.g. a photograph or illustration), a brief description, and possibly some additional details (e.g. estimated styling time, suitability for different occasions, etc.). The user should be able to view more information about each style by clicking on it, or to go back and modify their input criteria if needed.

Style details: When the user clicks on a recommended style, they should be taken to a page with more detailed information about that style. This page should include a larger and more detailed visual representation of the style, as well as any additional information that might be relevant (e.g. step-by-step styling instructions, product recommendations, etc.). The user should also have the option to save the style to a favorites list or share it with friends.

Favorites list: This page should allow the user to view and manage their saved styles. They should be able to view a list of their favorite styles, delete styles from the list, and perhaps even organize the list into different categories or tags.

Other features: Depending on the specific requirements of the hair style recommender, there might be additional features that could be included in the user interface. For example, the system might allow users to upload a photo of themselves and try on different styles in a virtual "hair salon" to get a better sense of how a particular style would look on them. Alternatively, the system might include a social component that allows users to browse and rate styles submitted by other users, or to share their own styles with the community.