Im watching DS9 for the first time. I just finished season 3. It's a little disappointing how little Odo has used his shapechaging abilities so far.
One thing that has been bothering me though... Odo spends almost all of his time in humanoid form, but he still cant quite get the features right. The Founders surely spend most of their time NOT in humanoid form(they dont live among humanoids), yet some of them have been shown to copy people so well that they can replace them.
It would have been neat if they had used less and less makeup on Odo each season, as he slowly learned to get humanoid features right.