Hello!!
You would like to have an ILLUSTRATOR artist to do " range of cute, happy, colourful monsters doing basic household tasks" ILLUSTRATIONS? Just message me I've done similar type of TASK RECENTLY.
Check my portfolio here
https://www.freelancer.com/u/viranianum14
1) I can send you designs as per your need with unlimited revision on the selected design.
2) After completion of the project will provide you all source files including JPEG,png,pdf,Ai,.Eps, PSD, SVG
Thanks,
Regards
Sahil!