Right-facing artist dropdown images, add artist to non-length draw blocks

Requested tweaks to the artist draw blocks.

- Add right-facing versions of for Draw East dropdowns (#73754180)
- Add artist character to non-length direction blocks (#73755214)
- Crop short versions of dropdown images (regression from purple crayon -> artist asset change)

![image](https://cloud.githubusercontent.com/assets/206973/3403143/60cae2c4-fd63-11e3-855f-9168f49dddd6.png)