The thing with coloured pencils is that you have to be patient. You have to work very slowly, adding layers on layers, because you haven’t got a palette to mix the colours on. You mix them on the paper. The second important thing I learnt in the meantime is: Keep your pencils always pointed! Only then you can put layers on the paper in a light manner which makes it possible to add one layer after the other.
I definitely have to work on my patience. With pen and pencil I could throw a quick sketch on the paper, and it looked not too bad. With coloured pencils it looks sloppy and bad. So let March be the month of patience!