My most frequent medium is watercolor, but I sometimes worry that it doesn't have enough impact. I just tried painting the same image in four different ways to see which I prefer and I'd love to get feedback. Here they are in the order that I did them. For the first one I used water soluble colored pencil on brown kraft paper. I printed out a scanned pencil image and then colored it. I didn't stretch the paper so it got a bit wrinkly when I added water. The lettering is collaged on top.
The next one is gouache with a little colored pencil and marker.
Next I tried the ink and gouache method I've used before (explained here).