Having problem with Cookies on the board

(Really annoying I had to disable cookies in options)
Anyway;
Basically I need some feedback on my ground tiles, I only Just started and I'm not that great of an Artist, but I can try
I'd prefer constructive criticism, to plain nasty comments
Fire away
If anyone has some tips for wood that would be helpfull, cause I'm finding it hard to get it to look 'woody'
