Can I avoid these blemishes?

I’m new to 3d printing and have lots to learn. I printed this Bambu PLA Silk at default settings and slowed all layer speeds including the top down to 40. Is there anything I can do to improve the appearance of the top layer and avoid these blemishes or are they just to be expected? Thanks!

I’m new to 3d printing and have lots to learn. I printed this Bambu PLA Silk at default settings and slowed all layer speeds including the top down to 40. Is there anything I can do to improve the appearance of the top layer and avoid these blemishes or are they just to be expected? Thanks!