@jwidness pretty much covered it, but I think you should also take into account how much effort you want to put into making annotated observations. Have at it if you’re fine with making multiple observations off of a single picture. Some people will take a photo of something like ten male mallards (just to use an example), number them, and make 10 observations. Some people will make one observation for male mallard. Some people just leave the gender field blank if it’s split. All of those are helpful observations. What would be least helpful is not making any observation at all because you are tired of nit-picking every last detail in the annotations. Find your comfort level, do what you prefer, and carry on making observations.
Also, welcome to the forum!