What has already been said, I agree with (no grain on hello kitty, and bad perspective). In addition to this the levels look wrong, particularly in the black outline of hello kitty (adjust the output black level to be more grey, maybe to ~23). The tank texture in the white regions looks like the hello kitty is an overlaid layer with some transparency applied. If you paste the first result from google images for hello kitty into the picture, by scaling and rotating the image you can make it fit perfectly. Experimenting with the transparency, it seems like a 60% opacity seems about right to mimic the result. Finally: http://www.diyrepairguides.com/wp-content/uploads/2009/12/Build-a-Septic-Tank-300x225.jpg
Sure, it wouldn't be nice if you and your child got split up, but the world cannot stop on the whim of one person. It should not be expected that the world should stop if you make a careless mistake.
As Jack said, the "rear" sphere (darker) is a bit larger than the lighter sphere, and when the lighter sphere is placed on top of the darker sphere, a significant portion of the bottom of the sphere is left uncovered.
Worry less about your verbiage and more about your grammar.
Finally: http://www.diyrepairguides.com/wp-content/uploads/2009/12/Build-a-Septic-Tank-300x225.jpg