Qnipaint is the best app to add watercolor effect to your photo.

Features:
• Create beautiful watercolor paintings automatically.
• Real-Time Watercolor Simulation.
• Make your photo a smear effect like a real watercolor.
• Control of lightness paper color-filter and detail.
• Apply painting modes: people mode scene mode.
• Export high resolution(FULL HD) images
• Share photos on social media easily.