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Can't wait to take this class.This is looking really nice!! I love the idea - I think it's very sweet and a bear would be lucky to have such a nice lamp.
Some things that I think you could work on - the shadow below the stump. It currently has some soft edges, some hard edges, and is probably a little too long if the candle is the only light source. Because the candle is above (unless there is another light source we are imagining) then the shadow would be quite short. It also is lacking the darkest point right at the base of the stump where the stump actually connects with the floor.
Shadows are darkest at the point of contact - see below where 9 is directly under the cylinder and then it fades out. Now this cylinder is lit from ways away and at a low angle due to the length of the shadow as it moves away but the concept stands. It would help to ground the stump to add a darker point below it.
I also think the line qualities between your stump bark texture could be lightened up a little. The line quality in your can is quite delicate and contrasts heavily with the thick dark bark lines. It feels as though they are drawn by two hands to me right now.
I would also try playing with the color of your lines! They don't have to be black 
perhaps they are black lower down on the stump but then drift more towards a warmer browner line at the top, adding to the idea that there is light from above. Maybe the can has some subtle blue lines around it. Or is rimmed with a yellow line to create the effect that the metal is glinting a bit!
I hope you build more in this bear world. I look forward to seeing it!