She looked up at him with wan smile and touched his cheek. I'll be with you in spirit. Koburn captured her hand and kissed her knuckles, relishing the salty sweet taste of Lydia's skin. I will be back. Another way we know we are with your viewpoint character is when we are told of their physical condition.
Smells are powerful tools as well.
Remember that we have physical reactions to emotions and describing those reactions are far more immersive than just saying a character is angry or sad. Use partitioning whenever possible. When setting a scene, try to move characters around so that only two or three are in the frame at the same time. Conveniently move the others off, or have them doing something else so you can focus on the characters most concerned with the dialogue. Handling groups of characters will always be a particularly difficult chore.