I love laying down wet watercolors or acrylics and covering the still-damp area with either plastic food wrap or waxed paper. In this instance I used the latter, shown here atop washes of acrylic loosely based on a landscape.
Then I allowed the paint to dry and carefully peeled off the waxed paper.
Go back into the painting with accents and details if you wish. (I left this one as is.) Seal the finished piece with acrylic varnish if desired.