1. Determine the basic shape of the blue skinner: The blue skinner is usually described as a long strip with a pair of big eyes on the head and wings similar to fins on both sides of the body. So when drawing blue and thin, you can first outline its basic shape with simple lines, including head, body and wings.

2. Refine the characteristics of blue thinness: On the basis of basic modeling, we can further refine the characteristics of blue thinness. For example, you can draw big blue eyes, a sharp nose and mouth, and spots and textures on your body. These characteristics can make blue thin more vivid and interesting.

3. Coloring: After drawing the basic shape and characteristics of blue and thin, you can color it. You can choose bright colors, such as blue and yellow, to highlight the characteristics of blue and thin. Pay attention to the collocation of colors and the contrast between light and dark when coloring, so as to make the picture more stereoscopic and vivid.

4. Add background: In order to make blue and thin stand out, you can add some background elements. For example, you can draw a blue and thin scene in the ocean, or draw some other marine life as a foil. These background elements can make the picture richer and more interesting.

5. Perfect the details: After the painting is completed, you can perfect some details. For example, you can add some light and shadow effects to make the picture more stereoscopic; You can also add some detailed textures to make the picture more realistic. The treatment of these details can make the painting more perfect.

Precautions for painting:

1, determine the theme and purpose: Before you start painting, you must first determine the theme and purpose of painting. This helps to set the tone and direction for the work, so that the creator can create more intently and purposefully.

2. Observation and investigation: Painting needs in-depth observation and investigation to understand the relevant knowledge and background of the theme. This helps the creator to better understand the theme and inject more details and connotations into the work.

3. Composition and layout: Pay attention to composition and layout when painting, and arrange picture elements reasonably. This helps to make the work more balanced, harmonious and layered.

4, color matching: color is a very important aspect of painting, we should pay attention to the color matching and application. Choose colors that are consistent with the theme and purpose, and pay attention to factors such as brightness, contrast and saturation of colors.

5. Detail treatment: Pay attention to detail treatment when painting to make the work more vivid, realistic and textured. Attention should be paid to the details of the picture, such as texture, lines, light and shadow, so as to enhance the expressive force and appeal of the work.

6. Constant practice and study: Painting needs constant practice and study to improve one's skills and aesthetic level. We should master the skills through constant practice and practice, and learn from the works of other artists to get more creative inspiration.