The phrase "a pretty good impression" is correct and usable in written English.
It can be used when describing someone's ability to create a favorable perception or representation of something or someone.
Example: "After his presentation, I must say he left a pretty good impression on the audience."
Alternatives: "a fairly positive impression" or "a rather good impression".
Which he cleverly combines with a pretty good impression of an actual gecko.
Together," he said, doing a pretty good impression of a traditional cable-news host.
That reptile probably got a pretty good impression of humanity in that brief moment.
Jeremy: "I dunno, I think I made a pretty good impression... ...... Mark: "Jeremy please, don't smile like that.
-- and he had left behind this peculiarly named, peculiarly tall, mustachioed man who could do a pretty good impression.
This sentence gives us a pretty good impression of Holden's attitude – straight to the point and just dripping with razor-sharp irony.
Still, he's doing a pretty good meerkat impression as well, and that's enough to maintain my interest.
Geithner "is doing a pretty good Joker impression outfoxing FDIC Batgirll' cop Sheila Bair, who's pushing for the busting up of ailing Citigroup," the caption read.
In the early sixties, Carlin, back in his suit-and-tie days, did a pretty good John Kennedy impression, adding "R"s to the ends of both "Vienna" and "Austria," and nicely mangling Khrushchev's name.
The England captain wasn't to be out done though and he revealed that he could do a pretty good David Beckham impression, and after taking in four balloons worth of helium, he proved it!
While it's a ridiculous neologism, Microsoft's 'Lapability' comes to mind when using the Logitech Slim Combo, since the back case includes a fold out kickstand that does a pretty good Surface Pro impression, letting you prop up your iPad Pro with a wide range of possible angles.
