Soejima's art changes pretty much all the time which is why P2, P3, P4 and Arena sometimes look radically different as far as their artwork is concerned. It got a lot more refined and unique over the last few years and considering that Soejima is apparently drawing since he was a child that's only to be expected. However, as far as this picture is concerned, it's pretty much in line with his more rough Arena art.
If you want to see for yourself how much his art changed so far, I suggest you take a look at his work from Soul Hackers:
Source with even more SH-era Soejima art
I'm sure you can point out the differences by yourself. I like how his older art looks sometimes a lot like
the art of AKIRA author Katsuhiro Otomo. By the way,
Yoshiyuki Sadamoto of Evangelion fame had a similiar artstyle in the 1990s.