pog i have found the tree/bark in the tree lab is only a reference to what the trees really lok like. Take for instance the Ecalyptus bark in bryce looks nothing like the bark on any Ecalyptus trees here in Australia. So i think you did an excellent job on the Joshua tree, i'm just annoyed my scanner doesn't work any more because i have a U2(the group) poster of their album the Joshua tree with a nice image of the tree on it that you could have used for a reference pic.

I have opinions of my own -- strong opinions -- but I don't always agree with them.