This is what I do when class isn't all that interesting ;) Took me about 5 minutes to do the outline, and have just kept adding and adding to the shading every day/ Just have to make sure I stop where I am as to not go overbaord with it!
Its weird, I have alot of confidence drawing in pen! Im not sure why lol! I have my days where Im in class and just randomly draw horses. They usually turn out really well! I think its because I can't erase it if I make a mistake so I try to not make mistakes :P