My partner is doing the digital drawing part and I am just visualizing the final product and helping do the drawing. (informal) My partner does the digital drawing while I help by visualizing the final product. (formal)

Help can be used with or without to: Jack is helping me to tidy my CDs. or Jack is helping me tidy my CDs Answer taken from the book "English Grammar Today", © Cambridge University Press 2011

both are correct

Helping TO do