Best face shapes for men or women. You can try any hair styles that you wish. Just avoid any hairstyle that cuts into the ovalness of your face like bangs or angled bob as they will cover your forehead and make your face look less oval. Choose a hairstyle that flaunts and highlights your oval face. Medium length hairstyles or long hair, irrespective of whether your hair is straight, wavy or curly, will look good on oval face. I could go in more detail if you feel comfortable sharing a picture of yourself here.
Both have a slightly different hair styles suiting the face. Triangle face can rock undercut hairstyle. Undercut can be faded or disconnect depending on your personal choice. Though for square shape faces I don’t really support undercut style, try to have slight medium length on the sides, use length on top use variation and style to create u prefer.
I am not sure of your gender, since it is a work place. Keep your hair styles, clean and away from your face and ears to look presentable. Especially if you are a guy with longer hair. If your hair is too long to be slicked back try tying your hair into a low ponytail. If you are a girl keep your hair if in medium length into a ponytail or keep it down , longer hair can be kept into a simple ponytail, braid or bun depending on your hair length and how comfortable you are with your hair. Both guys(if hair is in medium length or longer) and girls need to keep their fringes away from their face and keep your hair away from your ears especially for a guy with longer hair.