Thanks! I updated with some corrections including a bit more contrast around the bottom. I am trying not to stray too far from the 5 grays I have, so I couldn't do too much without creating more clusters or adding a darker color. Maybe I should split the shade count to 3 grays & 3 slightly olive colors? That's really daring territory for me!

I've not seen Wall-E, but I am sure I'll love it and it's on my to watch list!

Thanks for your input! I will read the tutorial and you are right in that the outline was way too bright on that one. They all could use an improvement in that area.