Illustrations of Nature Characters

I am looking to have illustrations designed based around themes of nature and outdoors.
Please see attached the style of illustrations that I would like.
I will be having them web and print based, so ideally vectors uploaded in Ai would be ideal. EPS, PNG, JPEG, Ai.

Needs to appeal to children, be colourful and playful.

PLEASE SUBMIT EXAMPLES OF PREVIOUS ILLUSTRATIVE WORK.

Initially I will require 15 'characters'
frog
hedgehog
robin
rabbit
duck
squirrel
owl
woodpecker
grass snake
fish
spider
badger
mouse
snail
butterfly

However this work will be on-going if more characters are needed.

Thank you :)