maybe 440,600,500,700, or 880 hammer units.Something like this only less ivy.
And no sighns.
and the roots are spread out more and they are bigger with less roots.
And get rid of the background.If you can, make a skybox version as well.
The modeler can do as many sizes as they want, but have at least one of the sizes i said in the first line, and i would love to have several skins.At least 2 skins.