Okeydoke. Here's my two cents.

• Your leaf forms are great for the most part

• Be careful with the leaf's contour lines so as not to undermine your initial form. If the contour doesn't add anything useful, don't draw it.

• Arrows are spot on and give a real sense of depth and gesture.

• Make sure to work additively with leaves so you can bring out their silhouettes with more impact.

• Your 'plants outside my house' section seemed to be a little lazy with form and contours. But then again, drawing from life is far more difficult than drawing from a 2D reference image. Also be sure to take advantage of line weight and cast shadows a little more to help clarify sections with lots of lines.

• Don't be too repetitive with silhouette lines. This may detract from a drawing's natural feel.

• Your page with the Sunflower is looking great.

I can tell you have improved during this lesson. I found that, for me, the next couple of lessons really solidified the techniques introduced here and so I think you will benefit greatly from moving on.