Art of Nikolas Ilic: Tree Designs!
Trees Screen Print by Eloise Renouf More
These trees (especially third from top, and first) could look natural and like the right kind of tree. Color is good.
Tree illustrations vector | Free Stock Vector Art & Illustrations, EPS, AI, SVG, CDR, PSD
Guestbook Tree Illustration by Anne Herbst, via Behance
Google Image Result for http://drawn.ca/wordpress/wp-content/uploads/2009/07/navie-peach-beech.jpg
Pine tree! Illustrator Narda Lebo
Winged Maple Seeds botanical digital giclee art print by GollyBard, $36.00