Well I can't figure out the "lion" here, I think lightbulb would be more appropiate
I may have got something for you, we did it at school some time ago, and it's quite easy to get fine results. Take a photo of something you want to draw, then add a grid with let's say 10x10 squares. Then take a piece of paper and draw each square seperately as you see it. Do NOT use any rulers or something, just look at the original photo and try to redraw it. Use lines only and don't try to put in shadows and stuff. When you are finished, erase the grid lines and redraw the parts that you accidentally erased while doing that. Scan or copy the linework.
Afterwards, try to add lightning to the scene. You may look at the original for that, since it isn't that easy.
When finished, you should have a quite accurate drawing of the original. What's the use, you say? It's quite difficult to add shadows to a drawing when the linework is anatomically strange, because you always think hey this looks plain wrong. Because you have a copy of the lineworks, you can always retry your shadowing. You can imagine different lightsources coming from different directions. You will find that lighting a scene changes the scene mood completely - if you didn't know yet, which i doubt
Anyway, welcome back guys!
There is a day when all departs
I´m coming out of age,
all your chains and all your wards
someday will be unmade.
Be prepared of me these days
as all of you shall be
when all my false and rodent faiths
break ´way just as do we.