When you're new to writing, you'll eventually hear the adage, "show, don't tell." You may understand how it's helpful--the readers get to experience the story instead of being told every single thing--but you don't exactly know how to execute it. It might go over your head altogether (I know it did for me when I first started writing). If that's the case, I want to show you my glossary of showing instead of telling to give you an idea of how to execute this writing technique.
Emotions
Anger
gritted teeth
clenched jaw
hands in fists
raised voice
Sadness
withdrawal
poor posture
frowning
soft-spoken
downcast eyes
Excitement
waving hands around
jumping up and down
yelling/whooping
excessive smiling
restlessness or boundless energy
Fear/anxiety/guilt
frowning
sweating
leg bobbing up and down
wringing hands
dry throat or mouth
pale face
they touch their face a lot, especially if they're lying
avoiding eye contact/darting eyes
fidgeting (playing with hair, fixing clothes)
body oriented in a way that suggests they want to leave the room
if the person is outgoing, maybe they talk too much or laugh a lot
if the person is quiet, maybe they retreat
Jealousy
glowering/glaring with narrowed eyes
embittered words
depending on the character, they may either retreat in despair or show off to prove their superiority over the person they're jealous of
*see anger*
Personality traits
Organized
describe the cleanliness of the house; everything has a place i.e., the bed is always made, dishes never in the sink, etc.
show the character cleaning their house, workplace, purse, etc.
maybe they have a specific process, like color coordination, alphabetization, labeled compartments for everything
Shallow or superficial
they're always talking but not really saying anything; they always keep the conversation at a surface level and avoid conversations of depth
they talk over other people
bad at listening
their words sound rehearsed or wooden
they don't let anyone get close to them
avoid somber moments and always want to lighten the mood
Shy and lacking confidence
don't talk often; when they do, it's brief and soft-spoken
avoid eye contact by looking downward
don't initiate conversations with people one-on-one or in a crowd
stiff body language/constantly self-conscious
crossed arms or hands (or they carry around an object in front of them as a barrier between them and others)
Loud and lacking confidence
talks a lot and doesn't listen well
avoids eye contact while talking
makes jokes at the expense of others (one-upping)
always joking around in general and trying to get others' attention
always trying to prove themself at work, in sports, the opposite sex, or any area of life they care about
Flirty
lingering eye contact
a knowing little smirk
a glint in the eye
gaze goes back and forth between eyes and lips; or eyes and body
always looks for excuses to tough the person: a light touch on the shoulder or arm, bumping into someone "by accident"
teasing
likes getting attention
Vain
stops in mirrors or reflections to check or appreciate their appearance
maybe they buy a lot of products to keep up their appearance, i.e., hair products, clothes, makeup
posts a lot of selfies on social media
wearing stuff that draws attention, i.e., high heels, tighter clothes, anything showing skin
likes talking about themselves
might exude insecurities (whether true or false) so people rush to disagree with it (i.e., fishing for compliments)
Guarded
crossing arms or legs if seated
selective about what they disclose to people; might get on-edge if they perceive anyone is trying to pry into their private life
passive in conversations (doesn't engage)
Note: In no way is this list all-encompassing. It is merely meant to be a springboard and starting place for you to build upon. There is no shortage of ways you can express emotion or personality. In fact, each character is going to show jealousy in different ways, for example, or express their insecurities uniquely. Do what works best for each character, and don't be afraid to get creative!