Open rose image and turn into a line drawing to use as reference for petal shapes and leaf placement. This layer is deleted in the final image.
Tutorial for turning an image into a line drawing .....
Copy merged image, paste as new layer, duplicate the merged layer, filter one with with oil paint and the other with fractalius. Blend both layers using 50% soft light mode. Add a plain border by increasing canvas size and flood filling the canvas area with chosen color. Increase canvas again and flood fill canvas area with black.