Hi Regine! Thank you so much for your comment.
I colored this using j) Watercolor Texture, which is included in the default bundles in Krita at the moment of installation, both PC and mobile versions of the app. Just search for it in the Brush Presets docker (or the Manage Resources window, should be in the Krita_4_Default_Resources bundle) and you’re ready to go.
I also recommend this bundle if you want more variety in terms of texture and watercolor effects.
Hope it’s helpful!