How can I describe when you want "sell" your image, sell how good you are at your job, for example?
What phrase or idiom can I use for that?
Here in Brazil (Portuguese) we have a metaphor like: "He sells his fish…", which means that the guy did his job very well.
Is there something like this in English?
Best Answer
I think you've asked two separate questions:
What do you call selling your image?:
Selling yourself or Self-Promotion
Then, I think you've asked for some idioms associated with this activity that mean you've been successful at selling yourself.
If it is an entertainer you can say:
If he's a salesman you can say:
If he's a lawyer or businessman you can say:
This last one means he brings in money and clients with his mere presence. (i.e. He makes it rain money.)