Hmmm... the Word 2007 Developer Reference is extensive...

After some experiments, I found that:

# Add the doc
my $doc = $word_ref->Documents->Add ;

my $obj_sel = $word_ref->Selection ;

for (1..$count) {
  $obj_sel->InlineShapes->AddPicture($image) ;
  $obj_sel->InsertBreak() ;
}
[download]

appeared to do the job.

I discovered this by using the "Record macro" function in Word, doing the operations to insert a picture followed by a page-break, and then translating to Perl...

...the reference documentation will tell you what the things recorded in the macro are doing. But it's hard to discover what you need to do what you want -- which is the advantage of the record macro trick.