Jim mastered quite a few things with Selina Kyle during his run. The eyes had that cat-like stare effect, she always looked feisty and the hair never seemed 'tacked' on to her head but apart of it - as opposed to many of his competitors.
His biggest claim to fame though, is that he made his mark as a bad girl artist, in an age of 'hardly-any-costume 'bad girls'', by drawing a fully-clothed woman.
I always respected that DC didn't have Selina go all 'Elektra-ish' just to grab a few more 90's dollars. They trusted Jim's skills with line and body language. And just look at the result.
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