1. **Eyes**: The person's eyes are wide open, which can often indicate surprise, shock, or alertness. The eyebrows are raised and slightly curved, which further reinforces the expression of surprise or realization. The slight glisten in the eyes may suggest the beginning of tear formation, indicating emotional distress or overwhelming feelings.

2. **Mouth**: The mouth is slightly open, which can show disbelief, shock, or speechlessness. It appears that the person might be mid-sentence or on the verge of speaking, indicating a need to communicate or express what they are feeling.

3. **Skin**: There's a noticeable sheen on the person's face. While this can be a result of lighting or the environment, it can also be a physical response to strong emotions, indicating stress, nervousness, or anxiety.

4. **Overall Facial Expression**: The combination of wide eyes, a slightly open mouth, and raised eyebrows gives an overall impression of shock, disbelief, or realization.

5. **Genuineness of Emotion**: Given the combination of features presented, the emotion displayed seems genuine. However, the context in which the image was taken (e.g., if it's from a scene in a movie) could influence the authenticity of the emotion.