Another thought, you can use your walking foot to do a simple outline of an owl in each block, after you SID around the outside of each block. But you will need to stop every 2-3 stitches to re-align your stitching to the curves. It sounds tedious but I have certainly done it in the past and it works well - your feed dogs are up - try it on a sample first. Here is a colouring page you could simplify one of these outlines.
http://www.coloring.ws/owl.htm