The card on the left is on rough textured cold press watercolor paper. The card on the right is on smooth hot press watercolor paper. It takes practice on the amount of water to add. If your brush is too wet or you keep trying to fix the color, the water bleeds out over the edges of image and dilutes the color.
I found it works better to allow image to dry before correcting color. If I needed to add more color, I would rub the wet brush directly on the crayon and paint that color onto image. If I want to remove color, I add plain water and blot the color off the image with a paper towel. It will take me more practice to become satisfied with my results.
I found a very old pad of mulberry cardstock and used that for the background. I used Cuttlebug embossing folders for added texture on my cards. Frames are cut with Spellbinder's dies.