I think @TessaW nailed it regarding the importance & non-importance of the follower/following ratio.
I wouldn’t worry too much about followers per-say. You need to ask yourself what your ultimate goal is… ultimately get paid for you art. I’d prefer to have 100 followers who regularly buy my art than 10K followers where they just ‘like’ my art.
That being said, just putting out good content isn’t enough. Just like @smceccarelli stated marketing your work is important. Leveraging off influencers and curators is always a good strategy for any marketing platform.
There are plenty of paid and free curators on Instagram that you can leverage off. I would hesitate paying, but with many of them if you tag them you go into a ‘draw’ to be featured. I’ve had one of my portraits featured and I got around 50 new followers.
Also, spend time to consider who you are targeting. @smceccarelli mentions they try to get their work infront of childrens writers, editors and art directors – people that will directly contribute to the bottom line. Consider the audience different curators and influencers have. Are their followers your target audience?
The same goes for hashtags. Consider what type of hashtags your target audience will follow.
Regarding @Alexis-Janis question regarding buying instagram followers. I would avoid this. Why? Firstly, many of these services can use bots, and if they don't many of the followers are usually low low quality. I wouldn’t bother. I’ve never had any long term succeed using these shortcuts with client accounts.
Also consider how you can direct traffic outside of Instagram to your Instagram.
- Do you have an email list? Encourage them to follow you on Instagram.
- Do you show your art at markets or conventions? Get them to sign up to your email list or Instagram.
- Are you successful on other social media? Promote your Instagram on other social platforms.
- Have you considered guest posting on a children’s writers website? You can link to your website or Instagram from there.
- Maybe you know of a podcast that art directors listen to? Come up with something of value you can share with their audience, and reach out to the podcast host.
Hope that gives you some ideas.