List of articles:
# 0 Introductory article
# 1 Missing pictures
# 2 Error 403/404/500
# 3 Unsupported format
# 4 Unapproved characters in URL
# 5 Image dimensions
# 6 Image data size
# 7 Identical pictures
# 8 Transparent background
# 9 Watermarks
# 10 Position, Alignment and Product Size in the Picture
# 11 Image Quality
# 12 Other minor mistakes
