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You can use your action to cause the image to move to any spot within range. As the image changes location you can alter its appearance so that its movement appear naturel for the image.

So, we know that when the caster use an action to move the image, the movement appears natural. But what happen if the caster uses his action to do something else, like, cast a firebolt? Will the image become perfectly still?

Let's say a caster uses his action to cast the image of a campfire with silent image.

  1. Will the flames flicker naturally? Or does he have to use his action so the flames keep moving? What happen if he doesnt use his action? Do the flames froze and become perfectly still?

  2. When casting silent image to create the image of a campfire, can the caster make it looks like the fire is lighting up (starting from a spark then grow)

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Probably Not, that's what higher level illusions are for

Your quote for Silent Image covers what you can do with it (emphasis mine):

You can use your action to cause the image to move to any spot within range. As the image changes location, you can alter its appearance so that its movements appear natural for the image.

Let's go over your questions:

  1. Will the flames flicker naturally? Or does he have to use his action so the flames keep moving? What happen if he doesnt use his action? Do the flames froze and become perfectly still?

In this case the object would remain the object and most likely be still. Whether or not a campfire would be an object will be up to the DM. In order to have the Silent Image move RAW, it must move to a new spot within range. As the image moves to that spot, the apperance is altered to appear natural. You'd need to move the campfire around in order for the flames to flicker, etc.

  1. When casting silent image to create the image of a campfire, can the caster make it looks like the fire is lighting up (starting from a spark then grow)

No. Again, the way for Silent Image to 'move' is to have shift locations and it will create a natural appearance of movement.

Campfire maybe, Light No.

As shown in this question Silent Image does actually produce light or simulate it. You may have an image of an object, but it's a static image that does not have "any other sensory effects."

Major Image has the additional language:

It seems completely real, including sounds, smells, and temperature appropriate to the thing depicted.

You could emulate terrain on fire with Hallucinatory Terrain and Mirage Arcane, which states:

You make natural terrain in a 150-foot cube in range look, sound, and smell like some other sort of natural terrain.

Silent Image can do a lot of things, but it is not a replacement for higher level illusion spells like Major Image, Hallucinatory Terrain, Programmed Illusion, Mirage Arcane, etc.

You may argue that light is light, but in this case, illusions do not work like. See the following questions for additional support:

Can you create an illusion of empty space

Can you use minor illusion to create an illusion of a working mirror (CLOSED AS OPINION BASED)

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    \$\begingroup\$ So, from your interpretation, it would be impossible to create any kind of credible image of something that is not moving ? Stuff like a water fountain, a fire, a living thing that stay in the same place (tree, animal, humanoid, monster, etc.) would be a no-go with silent image, because there is inherent movement to all of them (leafs moving because of wind, water running, flames flickering, breathing, changing posture, etc.). The only 2 possible ways of using silent image with a minimum of credibility would be for static objet and continuously moving stuff. Am I undersanting correctly ? \$\endgroup\$ – silentimagehelp Jun 21 '18 at 20:00
  • \$\begingroup\$ @silentimagehelp yes, with regard to Silent Image. There are other (higher level) spells that can do things like that. \$\endgroup\$ – NautArch Jun 21 '18 at 20:03
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    \$\begingroup\$ This would be improved by stating what higher level illusion spells you are mentioning, and showing that they indeed are intended to do what OP wants silent image to do. \$\endgroup\$ – HellSaint Jun 22 '18 at 3:49
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    \$\begingroup\$ The phrasing in major image is almost identical. It says nothing about the image moving "passively". \$\endgroup\$ – Szega Jun 22 '18 at 8:50
  • \$\begingroup\$ @HellSaint I've added some more detail around the spells I think would qualify. \$\endgroup\$ – NautArch Jun 22 '18 at 14:10
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It is, after all an image. Therefore, by definition, it is completely stationary and unchanging while you are not using your action to move it. You can, however, use your action to move it to the same location where it was before, and making the flames flicker once "naturally".

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