@echo off
setlocal

set "filepatterns=Folder.jpg,AlbumArt*.jpg,AlbumArtSmall.jpg"

echo Files to be deleted:

for %%a in (%filepatterns%) do (
  for /f "delims=" %%b in ('dir /b /s /a-d "%%a"') do (
  attrib -h -s -r "%%b"
  echo Deleting: "%%b"
  del "%%b"
  )  
)

echo ===========================
endlocal
pause