On my Samsung Note 4 I have another photo app called Color Splurge. This app converts pictures from color to black and white. It then allows you to create an image with selective color. You chose what you want to show the color on. Here are three quick samples.
It also gives you the option to completely change the color to something totally different.
It has an adjustable brush size and you can use the stylus or if you prefer your finger.
This app is available for Androids and iPhones.
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