Angelfish turning blue??

Okay so these pictures really don’t do it justice but I’ve just noticed today, my Angelfish have these blue marks (& also some gold marks but these are difficult to see on picture) appearing on there dorsal fin. It looks like glitter and is kind of an electric blue colour coming on.

Should I be concerned?

Looks like a really nice healthy Angelfish to me. Hard to really tell from pictures but if I had that fish I'd be proud.

Thanks for the response. To be more clear, it is these little “holes” in the dorsal fin, that used to be clear (some of them still are) have now turned metallic blue. It does look cool, as long as it’s nothing to be concerned with

Some fish take on new color as they mature. That appears to be the case with yours. Looks like a really healthy and well developed specimen so I wouldn't worry.

The blue colouration in the fins is just colouration and nothing to worry about.

The fish appears to be covered in excess mucous (in the first set of pictures) and this is usually from poor water quality.

Check the water for ammonia, nitrite, nitrate and pH.

Do a 75% water change and gravel clean the substrate every day for a week.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

Water quality is fine and checked weekly. Water is changed twice a week anyway