I don't really try to imitate anyone's style. But I sometimes copy some drawings to learn new techniques, it's not actually that hard to copy, but when you have to apply those techniques to your work by yourself it's another story.
My first big influence was Akira Toriyama when I was little and for some time later Kubo Tite. Now I aim for a more mature and detailed style, like Takeshi Obata, Yang Kyung-Il, Masakazu Katsura, Takehiko Inoue, Ishida Sui, Kentaro Miura, BOICHI, etc, etc.
Of course I'm still quite far from that, after all, all these people has been publishing manga for more than 20 years and I just started 2 years ago.