You can post your instagram pics on twitter as a picture and not as a link using IFTTT.
First you need to sign up to create your account,
Then click on "Browse Recipes" and search for Instagram,
Click on the recipe that says "post your instagram pics on twitter as a picture"
Then activate your channels, which means you need to sign into your Instagram and twitter accounts respectively to grant IFTTT access into your accounts.
Then just click on "Add Recipe" and you're sorted.
You just have to do this once and forget about it. They have a lot of interesting and genius recipes to choose from and you can even download their app on iOS or Android.
Have you ever wondered how people did this on Twitter? Is there any other way you like to do this? Talk to me in the comments down below.