$4.99 would be to high. That price range is right for apps like Snapseed (pre Google aquisition) that are billed as serious photo editors (tools in genreral can command a higher price.)
When you are at that price range, it also helps to have a lot of big published reviews behind it so customers can evaluate the purchase more easily. Popsicolor doesn't have any of those, and probably won't receive any, because it doesn't solve a particular problems other than being fun unto itself.
When you are at that price range, it also helps to have a lot of big published reviews behind it so customers can evaluate the purchase more easily. Popsicolor doesn't have any of those, and probably won't receive any, because it doesn't solve a particular problems other than being fun unto itself.