It's fine to make a nice series, but try to switch it up a bit. What program are you using? A free one like GIMP, which is like a Photoshop clone, or Photoshop, or possibly something like Paint?
It's just if you're submitting graphics weekly, we'd like to see some progress on them week to week, because people can get into a groove and pump out easy graphics in 5 minutes or less.