Look good.

The quality etc of sweet nothings though is far better

Possible answers depend on what is it about Lichtenstein that appeals to you.

Is it specific subject matters or themes he dealt with that resonate, like ordinary household objects, domestic interiors, or kitschy wartime- or romance-melodrama?

Alternatively, could it be more about the general look of Lichtenstein's paintings — i.e. replicating or alluding to comic book imagery, with thick outlines, Ben-Day dots, speech or thought bubbles, and onomatopoeias?

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1.  If you're drawn to objects and interiors, check out the minimalist and illustrative styles of Patrick Caulfield and Michael Craig-Martin.


2.  To a lesser extent, there's also Gary Hume, who blurs portraiture, figuration and abstraction.


3.  Especially for his cartoonish three-dimensional work, see Bill Barminski. Some pieces (including clothing) produced by Philip Colbert might interest you as well.


4.  If you're keen on 1950s retro, comic book-style characters combined with references to consumerist culture and malaise, look into Ben Frost.


5.  For portraiture with a flat and washed-out appearance, see Alex Katz. I initially dismissed his paintings and prints, but grew to adore many of them over time. What was once terribly dull to me, now feels reassuring (even noble) in its restraint and understated confidence.


6.  While I dislike most of what he produced, you might appreciate some of the still-life and portraiture by Tom Wesselmann — especially his line drawings from the 1980s onwards.


7.  Although it's generally seen as a bit cheesy now, there's been somewhat of a renewed interest lately in Patrick Nagel ("Her name is Rio and she dances on the sand").

It's also worth checking out fashion illustration more broadly. If you search hard enough, you'll find plenty of highly-talented individuals, including those who are still studying at art school.

[Personally, I view the output of Sandra Chevrier as mediocre fashion illustration, at best. Her style would have looked dated even in the 1980s.]


8.  Finally, a less-than-revolutionary idea: If you enjoy the aesthetic of Roy Lichtenstein, consider acquiring affordable works by Lichtenstein himself (e.g. official limited-edition prints), rather than by later artists he may have influenced.

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As an aside, your forum username always triggers the pedant in me. I assume the typo is deliberate?