Nice photo. I like the way the foremost three muffins are in focus, and while you can see the others clearly, they are slightly fuzzy.
The bright multi-colour muffin cases make them stand out and seem more individual. None of the muffins are overblown or burnt, in fact they all look very appetising and the good quality of the photo shows off their good points.
This is a classically good photo, the sort I might see in a top-class cookery/baking book. Keep up the good work, that's an excellent picture of some really delicious-lookng muffins that I now want to eat.