THEME : traditional + floral + spring + garden

Flower : light blue + yellow + cream + pink + mix of winter branch ( or add some pastel or green)
backdrop : since you said you like brighter theme ( photos you sent me) beige or white wall or white curtain with light beige/gray table cloth table
flower arrangements : prettiest seasonal flowers in the market. ^^

ADD - ON :

you can add flower budget to do fuller scene. ($300 + $1000)
Cake (depending on your budget $100-$500)
custom cookie ($75-$100)
basic rice cake/deserts ($50-$80)
design rice cakes/cupcakes $150-$200
name on the backdrop : ($100-$200)
flower crown $50

I think you like something like this feel. ^^ Keeping this in mind

how about making something like this table but use more blue/pink/yellow ^^ for more spring feel to it.

So sorry for ugly drawing. kk but something like this. ^^ but more green + flowers to fill table.

floral inspiration:

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depending on your budget we can order simple plain cake ( $150-$200) OR custom sugar art cake ($300-$500)
traditional noritagae cake you see on the photo you sent me is around $125

below : some custom cake idea

custom cookies to match theme + personlized with name ($75-$100)

since this will be traditional table, it will be great if you can add little budget for rice cake + desert ^^ basic rice cake/deserts ($50-$80)

OR
design rice cakes/cupcakes $200-$300 ( below photo)

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for 2nd scene we will use flower + greens from the 1st scene to make simpler set for cleaner look

Also, Yes we can do doljabe scene. ^^