Ok, so I think that InfinitePro is super awesome, but there are a few things to fix.
1. I think that it should not cost so much. $7.99 is a lot just for a app that has infinite storage/zoom/whatever you call it. Maybe $5.99 or $4.99 even!
2. If you want to keep the $7.99, then you should have tools like blending, and you should be able to use more than three colors at a time.
3. This one is completely optional, but I think that there should be little extra stuff, like stickers, or maybe a how to draw guide or something like that. Now, if you want to add that, it is completely reasonable to have the price $7.99, so… yeah
Thank you for taking the time to read this!