Cut six faces separately. If you choose with a dotted box, you can change the size and stretch six faces with the expected perspective of the product to make them conform to the perspective. You can refer to other people's packaging cases. I hope to adopt. You can PM me if you don't understand.

More questions and answers

In that case, it looks like a cardboard box without the soft feeling of plastic.

The light perception of plastic is caused by. But the general shape remains unchanged.

Then what should I do? Is there a specific tutorial or something?

Light perception is mainly reflected by light and shade. There is something in the middle of the plastic bag that is bulging and concave on both sides. If you look at the real thing, there are curved dark parts on both sides. After you finish the picture of the plastic window, according to the analysis just now, fill the dark part with black, choose the superposition mode after proper blurring, and then reduce the transparency and feel it. Then add the dark sides of the upper and lower ends appropriately, and generally draw the lower part. Analyze it carefully according to the real thing yourself.

When the dark part is done, you can start to heighten the light. You can choose to draw a white line like a picture, or you can determine the bright area like a dark part, fill it with white and blur, and adjust the transparency in normal superposition mode.

Generally, the transparency should be adjusted to a relatively low ratio.

It is much more convenient to use the deepening and lightening tools in PS!