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Looks is the second category of blocks, and it carries over 15 commands (7 as stage), 6 reporters, and 1 predicate (6 as stage). In Dev Mode there's 3 more commands. These blocks are used for sprite and stage appearance.

Block	Function	Options
Commands (15)
`switch to costume [ v]::looks`	Tells the sprite or stage to switch its current costume/backdrop to a different one.	Select a costume/backdrop to switch to. A costume (created by new costume, stretch or a list of pixels, for example) can be dropped onto the input slot.
`next costume`	Tells the sprite or stage to advance to the next costume/backdrop. If its currently on the last one, it will switch to the first costume/backdrop.
say [Hello!] for (2) secs say [Hello!] think [Hmm...] for (2) secs think [Hmm...]	Puts a speech bubble on a sprite in order to make it say something or think of something.
set [ghost v] effect to (0) change [ghost v] effect by (25)	Changes the amount of an effect.	Effects: Color: Any value can be entered; values greater than 100 or less than -100 loop over. Saturation: Any value can be entered; values greater than 100 or less than -100 are clipped. Brightness: Any value can be entered; values less than 0 decrease brightness; values greater than 0 increase brightness; values greater than 100 or less than -100 are clipped. Note that this does not set brightness, but adds to the original value. Ghost: Any value can be entered; values greater than 100 or less than 0 are clipped. Note that if you set the ghost to a number such as 200, the ghost reporter block will output 100, instead of the 200 that the ghost effect was set to. Fisheye: Any value can be entered; values less than 0 reverse the effect. Whirl: Any value can be entered; values less than 0 are clipped. Pixelate: Mosaic Negative
`clear graphic effects`	Sets all effects back to 0.
set size to (100) % change size by (10)	Changes the sprite's size.
show hide	Shows or hides the sprite.
go to [front v] layer::looks go back (1) layers	Changes the sprite's layer.	On the go to front layer block, you can change it to back to go to the back instead.
Reporters (6)
`costume #`	Reports a number based on what costume/backdrop the sprite or stage is currently using.
`[width v] of costume [ v]:: grey reporter looks`	Returns a value of properties of a costume/backdrop.	Name: Returns the name. Width: Returns the width. Height: Returns the height. Pixels: Returns the list of all pixels as RGBA values 0-255. Provide a costume/backdrop there. Select Current is read properties of the current costume/backdrop.
`stretch [ v] x: (100) y: (50) %::reporter looks`	Returns a image of an alteration of costume/backdrop. Use this to change its size, mirror it, or distort it.	Provide a costume/backdrop there. Select Current if you want to use the current costume/backdrop.
`[ghost v] effect::reporter looks`	Returns the current value of an effect.	Effects: Color Saturation Brightness Ghost Fisheye Whirl Pixelate Mosaic Negative
`size`	Reports the sprite's size as a percentage of normal.
`(new costume @list width ( v) height ( v)::looks)`	reports a costume based on the pixel data input as list.
Predicates (1)
`shown?::boolean looks`	Reports whenever the sprite is shown or hidden.
*Dev Mode Blocks (3)*
`console log [] @delInput @addInput::looks`	Logs the inputs,connected,by,commas into the browser console.
`alert [] @delInput @addInput::looks`	Opens a dialog saying "snap.berkeley.edu says Snap! inputs,divided,by,commas.
`save [pen trails v] as costume named [screenshot]::looks`	Saves the selected input as a costume with the name in the second input.	pen trails stage image