I did this profile sketch to begin the learning process for drawing G4 ponies. I used the head measurement, body measurements, and hair/eye pre-sketches that you can find in my gallery to do it and it seems to have worked well.
I understand it's not perfect, but this took a significant amount of time and effort (though it got far easier the further I went). Now that I have a sense for the relative sizes and positions for everything, a head-on sketch will likely be next followed by 3/4 view.
Once those are all complete, I hope I ready to actually do some fan art (I have several ideas in mind already)