Elf and Dwarf Drawing Practice

We were given an assignment to draw both an elf and a dwarf, measuring their height with set head lengths. The elf had to be 9.5 heads tall, whereas the dwarf had to be 4 heads tall. Here is my result:

As always, I had a bit of difficulty drawing in Photoshop as well as I do in the program I'm used to - Paint Tool Sai. However I'm fairly happy with the result of these. I did find it a little odd measuring head heights as this isn't usually something I do, and it was strange having to trust the measurement rather than my own feeling of what felt 'right'. The elf was definitely easier to draw, the dwarf was a greater stretch of proportions and took more effort to look correct. The one thing I want to improve as a result of this exercise is to become better at creating things in Photoshop, as I feel I have become too reliant on the stabiliser tool found in SAI.