Maybe you should have used a smaller brush to make it look more realistic? Mountains aren't just straight up, they have rocks jutting out and trees and other disfiguring features. A bit of shading may also help with that. ;D
OMG...my sister gets more comments on her drawings than me! hmmm...im gonna change my profile now...im 6 years old ppl...i can speak excellent english and french and i can divide and draw like Da Vinci!!!! :)....lol...nice drawin sis...
drawn in 25 min