Thanks for submitting some designs. We think #53 is your best one, but we'd like to see you switch the blue and brown. Also, is there any way you can get the colors similar to the logo we posted for ecological roof. We like that brown much better. It's up to you if you want.
On #56, we think you should drop the round graphic and go with the leaf only. You may need to add some color to that, but it's definitely interesting and has a chance with some modifications.