shellscript image leach example

Can someone improve on this? If a picture is missing, this script downloads a 4k stub of nothingness. This works out great for renaming, but afterwards I must go in and manually delete all of the 4k files. Can this extra process be scripted? If so how?

#!/bin/bash

mkdir ~/MainPicDir
mkdir ~/PicDir1 | curl http://www.heartbreakers.info/[2000-2050]/01.JPG -o ~/PicDir1/#01.jpg |
mkdir ~/PicDir2 | curl http://www.heartbreakers.info/[2000-2050]/02.JPG -o ~/PicDir2/#01.jpg

cd ~/PicDir1

num=1
for file in `ls`;do
mv $file $num$"A"$".jpg"
num=$(($num+1))
done

cd ~/PicDir2

num=1
for file in `ls`;do
mv $file $num$"B"$".jpg"
num=$(($num+1))
done

cp -r ~/PicDir1/ ~/MainPicDir | cp -r ~/PicDir2/ ~/MainPicDir

rm -r ~/PicDir1 ~/PicDir2

p.s. I know I lose in life