Ok entry
#4 is very cool. I think all great logos should be able to have extra color but then also stand alone monochromatically like
#4. This way they go on something like a coffee mug. This is nice and cheap to produce 1 color items. (But multi-color options are good for some print pieces like sweatshirts. So i get
#3 too)
I wonder if you took the burning bush and placed a hint of fuchsia in it. Because I see where you are going with
#3. There needs to be more color to anchor it. I am just not sure it is black. Maybe fuchsia highlights with a red highlight and predominately orange.
I see where you are going on the multi-color though. Good thinking.