First, you should clean your lines (especially if you use outline, which I personally don't prefer, but that's just me
) cause this way it looks very messy. Here is a quick edit of your drawing, so you can see how much it improves just by cleaning bad edges.
Second, I remove two colors (one on the top, one on the side) cause they were barely noticeable, and to similar to basic color beneath them. When you choose your pallet, pay attention to contrast between colors.
And final, I'm not an AA expert but I tried to make some quick AA in the top line of the canoe with colors that were already in your work. I'm sure that someone will give you better advice about this.
I hope that this was helpful.
