Once you have account on Instagram create a page where you can share your resources like small chunks of videos, photos. Create your own page on Instagram for Instagram followers. Instagram is having such facility where people can create their own page can share their resources. Once you have created your page uploads your pictures that best describes you and your work but you should only upload your best shots. If you would upload large number of images without seeing and without investigating about their pros and cons people can skip over them. Large number can only make your profile bulky and certainly it will consume your lot of time and if the content of pictures is not good then nobody will care for your images. So better upload your images in small doses that best describes the situation and you. Be selective in your approach when you are uploading images for your Instagram followers once you have built a bad image and create negative image in your followers mind that may cost you in future and count of your follower may decrease.
If you are getting 300 followers for one picture and 100 for other it means there is something in your approach selection of your images so be sure before uploading your images on Instagram. Instagram is very popular among peoples and so you must grab this opportunity and can increase your follower strength by your selective approach. Instagram followers would definitely praise your approach and if they will like your content then certainly count of your follower would increase. Within your interest you should approach diversity of shots, so they can grab the attention of follower. If photos may become similar that can distract follower and they would leave following you or might be possible they lose interest in your work. Before uploading anything go through your work selection and compare each of them and try to be choosy in your approach and think from viewer point of view. Once you realize that what viewer and Instagram Follower is looking for you start gaining good response from your follower.