First appearances are incredibly important. Snap judgements are made shortly after a person walks into a room. Same when we enter someone’s living space: depending upon neatness, we evaluate our feelings toward an individual.
Our characters are also defined by neatness. Well-groomed hair says a lot about how they feel about themselves. Same goes for the scrubby, dirty look that tells the viewer that either he hasn’t bathed in a while, or that he doesn’t care.
Your task is to create a credible description of your character. Think beyond clothes, hair, nails. Consider the state of the bedroom, apartment, kitchen. If possible, draw a picture of the individual and of the residence.
Next write a scene in which someone meets your character for the first time. How do people react? Describe the faces they make. The actions they make. Next take someone to the residence. Again, describe faces and actions.
Reread, looking for sufficient descriptors so that the reader clearly sees what you intend for her to see. If there are ambiguities, add information.
Have fun with this one.