Crab is a common marine life and a very interesting subject in painting. If you want to draw a simple and beautiful crab, you can follow the following steps:

Draw the crab's body first, which is usually oval or semi-circular. In order to have a more three-dimensional effect, you can add a small arc below.

Then draw the claws and feet of the crab. Crabs have special claws. They are shaped like human hands and consist of multiple joints. They are very flexible and free. Therefore, when drawing claws, we should pay attention to ensure that multiple small forks are drawn in each claw, which can add more natural and full feeling to the whole work.

Next, describe the details of the crab's head, including eyes, tentacles and mouth. It is best to draw the general position and outline with light strokes first, and then gradually strengthen the lines and highlight the details.

Colour the crabs. Crabs are generally red, but other colors will be referred to according to the actual situation. This step can be achieved through watercolors, crayons, oil paints, drawing boards and other materials.

Finally, check the shape and details of the whole crab again, and add more shadow effects with thin lines of black or other colors to make it more realistic.

The above is a simple and beautiful way to draw crabs. Of course, the specific painting method can be adjusted according to the creator's personal preference and skill level. But the most important thing when painting crabs is patience and care, because every outline is very important when painting, which determines the quality and readability of your painting.