Hey Sniz! Cool thread idea! Well, my thing at the mo is trying to achieve realistic images, and I'm no way an experienced artist, BUT the only advice I could give would be:
Go SLOW in a drawing and 'take the time it takes'
Details are what make it more realistc (I think) so add them
Be aware of textures, light, tonal values (says me! lol)
Be aware of the skeletal structure of the subject you are drawing.
Proportions are of course, crucial.
RESEARCH other artists
Experiment with medium
Accept constructive critiscism
Use nice contrast if possible to draw attention to the drawing
Use decent products
Find a good paper that you are comfortable using to bring out the best with your drawing.
Don't give up.
I personally work in layers and I find building up gives more depth.
Something I discovered was that mixing mediums can make drawings look more realistic. I've been using carbon, charcoal and graphite in drawings. Graphite is grey, period, and you won't get black blacks with it, and the darker you go with it, the more 'shiny' and 'reflective' it gets! Grrrr
JD Hillberry has some good info on this. He's on youtube too