"deepen impression" is correct and usable in written English.
You can use this phrase when you want to emphasize the lasting effect that something has had on you or someone else. For example, "The experience of visiting my grandmother's home country deepened my impression of the importance of family."
Mr. Bush's team, on the other hand, still smarting from the deepening impression that the president lost the debate and that he struck some viewers as peevish and annoyed, is hoping Mr. Cheney will reverse the perception and set the president up to put in a better performance on Friday night, when the next debate will take place in St . Louisin a town hall setting.
And yet the tape and the transcript do deepen the impression of blithe hypocrisy when it comes to the business of electing an obviously erratic man as President.
The forthcoming inquiry into his finances is likely to deepen the impression that the Teamsters, long affiliated with the Mob, remain rotten despite half a decade of efforts to reform them.
The stage designers' similarly dystopian settings seem to deepen the impression of dread, although only one team claims to respond to the rhythms while the other insists they render the excerpt's crude orchestration.
In the hours before Obama's speech, a series of news reports and document dumps concerning the role of Russian interference on Trump's behalf only served to deepen the impression of disorder.
You could argue that Haas and his screenwriter, Wendell Steavenson, have planned this deliberately, so as to deepen the impression of a country snarled up in loose ends — how can you hope to impose democratic discipline, after all, when a single dumb crime goes unsolved?
"To be frank, after seeing these reports, I've felt that the way in which a few American media have handled this may deepen the impression that people have held of the arrogance and conceitedness of some Western media," said Hua Chunying, a spokeswoman for the ministry, at a regular briefing in Beijing on Monday.
The new insights from Hubble deepen that impression.
It will, however, reinforce and deepen the impression that the GOP is insensitive and hostile to poor people".
I do think that the over the top attacks on Acorn will "deepen the impression that the GOP is insensitive and hostile to poor people".
Repeated hearing can correct or deepen first impressions.
