[oil/canvas] Trouble depicting forest-y mountains

[Wardy]

im not exactly a pro but this is what is drilled into me every day at school. work in thin glazes of colour, very watered down. find the base colour, so for the trees perhaps a muted dark green, then build from there. find textures or techniques that help by practicing in a sketchbook and experiment.
the main thing is, dont get attached- think of every painting as one you are going to throw away anyways, so just go at it. if its any good then keep it! sorry i cant be more help, thats all i have to offer im afraid, good luck, i know its scary!