Cis forConcentrate
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You are concentrating on something if you are completely focussed on it, and have blocked out all other distractions. People usually concentrate when they are doing something complicated that requires them to think hard without being interrupted.
Dis forDisappointed
When you become a little sad because something doesn't work out the way you thought it would, you are disappointed.
Disdain is a way of treating someone as if you dislike them and they are beneath you. The woman is looking at the man who is approaching her with disdain.
You feel disgust when you have a sudden, very strong dislike of something. Some smells, like rotten food, are disgusting. The person in the picture is disgusted.
Eis forEmbarrassed
You are embarrassed when you are made uncomfortable and self-conscious by something that happens. For example, you might get embarrassed when you make a mistake introducing yourself to someone you really like.
You forget something if you don't do it, but not on purpose. You might forget to do your homework, or go out and forget your keys.
The man in the picture has forgotten to put his pants on before he goes to work.