Unable to be determined from your photo
With no disrespect to previous answers, I am unable to determine whether you require extractions from this photo you have taken. There are many considerations other than crowding that determine the need for tooth removal including profile and periodontal health. This photo alone is not diagnostic, which is why you require a complete orthodontic diagnosis including x-rays, photos, and an examination before coming up with a treatment plan.
With Invisalign, some dental...