Here's the one for u/う. The word is uma/うま. More Photoshop coloring over inked work in my sketchbook.
In the background? You're right! That's a glue factory. Things don't look too good for this stallion.
Here's the sketch. The hiragana didn't make it into the colored piece this time. It just didn't look right digital. I should've just brushed it in. Next time...