Hi Caballero porcino,
One good thing to start with is to first place the lines that help to place the whole drawing so you can draw a little line to show where does it start and a little line where does it ends so that you instantly put the big proportions without going into the details. It allows you to whether fix it quickly since you just put a few line and make sure you focus only on proportions instead of drawing all those bumps on the body. You could also draw a big shape that contains the drawing. Keep in mind that it requires patience and a lot of practice. Hope this advice will help you. Good work :)),
Louis Gennart
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