Brad, I'm not a carver, but I will try to write a few things that I see. First off - it appears you have some serious talent for the carving aspect that just going to get better with time. You've got some skillz and I can't wait to see some of your future work! On the stippling, a random pattern looks better than rows of stippling. Above the coyotes head is an area in particular. It's not a big issue, just a small thing I noticed.
Are you going for a siloette profile, or are you wanting to put some carving details into the coyote? If you are wanting to put carving details into it, the area between the coyotes head and shoulder doesn't quite look finished yet. The neck area and where the coyotes ear will be could use some transition details. Again not a huge issue, but a few distinguishing details an area that will make it a bit better in appearance.
These are my opinions, so take them as that. I am really excited to see you put some carvings on your calls. This is going to be awesome!
Brian