#4: could you use the Green and White colors somehow? The oil drop can ben in black #1: doesnt really relate to oil #2: Maybe make letters a little thicker to see how it looks
#7: Could you make the trunk of the tree a little bigger? That tree is characterized by having a "big belly". Also, coul you show us different color combinations for the drop of oil? For example green. Thanks.
Thanks for the work. On the pumpjacks, I like the idea, however, the pumpjack drawing is not very accurate on how a pumpjack looks (it typically does not have the "tower"). Perhaps we can do one with a pumpjack and another design with a tower.
On the towers, lets not put the flame on top please. Thanks!