>>76733
Understand anatomy. Once you know how muscles flow, and the shaping of the human body works and changes, you can use that to create good looking inflation art.
You need to independently face your own hurdles with your own solutions. The biggest one is how do you specifically draw inflation? Is it just belly, is it full body, is it spherical? Each presents their own problems.
The biggest issues I often see are bodies versus bellies, once you reach a certain point, if your only inflating the belly, your left with this awkward and dumb little body resting ontop of the belly, which can look bad if done without thinking.
Then theres butts and breasts. Some people just do not know how to draw asses. They make two spheres and call it a day. Butts have shape, surprisingly complex shape, which varies person to person.
And then limbs. Theres many ways to mess up limbs. The general preferred method is donutting the limbs inside themselves. Hard to describe, but easy to understand in practice. But this does make doing stuff like the butt very complex.
Really it comes down to your art style, and your preferred type of inflation. It would be best if you posted some art as a reference, and workshopped it from there.