I have been spending all my hours redrawing kelp in high resolution for the Birch Outreach Van. It's been a year since I drew the original low-res kelp, and I have since paid more attention to kelp anatomy, and realized that my early drawings were a bit off - in terms of where kelp blades (leaf equivalent) part from the stipe (stem), how far the bladder (blublous thing at the base of the blade) is from the stipe, and the ridges along the edges of the blades, oh and the width of the stipe too. So along with redrawing, I changed a lot of the details.

Here you see a kelp frond in the midst of being changed. There are 2 intertwining fronds instead of one, and I'm adding ridges to the blades. There are 3 photoshop layers: the black outline, the color of the kelp, and the blue background, which makes it easier to see where I've colored the kelp outside the lines.