- Turn off playing in your Character Blueprint.
- Import the asset you want to add to your character.
- Check that the materials have no Back-Face Culling by checking the Two-Sided box in each material use.
- Go in to the Face Mesh of your head.
- Find a relevant socket to attach your model to. The sockets are displayed in the skeleton tree tab of the skeleton section of your Face Blueprint.
- Right click and add a socket to your chosen Bone.
- Drag your model from the Content Browser in to your character Blueprint.
- Scale the object to fit, you can make this exact by copy and pasting the scale of your body mesh if they are from the same model.
- Make the Model a child of the Face component.
- Select the Parent Socket that you created earlier.
- Re-position the Mesh if needed.