Here's an untested example of fetching all *.jpg and *.jpeg images from within a directory, then working on them with Image::ExifTool. It will search for the files recursively. If you don't want to find images in directories underneath of the directory you're looking in, put a ->maxdepth(1) line above the ->in(...) line in the call to File::Find::Rule.

use warnings;
use strict;

use File::Find::Rule;
use Image::ExifTool qw(:Public);

my $dir = '~/Desktop';
my @files;

if (-d $dir){
    @files = File::Find::Rule->file()
                             ->name('*.jpg', '*.jpeg')
                             ->in($dir);
}
else {
    die "that's not a directory dude!\n";
}

my $exif_tool = Image::ExifTool->new;

for my $img (@files){
    $exif_tool->ExtractInfo($img);

    # do other stuff with exif tool
}
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