I am not the character designer, however these are some inspirations that have been looked at for the character design. We have been looking at Groot and gloam, but we dont want out piece to be to similar to gloam.
Groot character designs (no date) Available at: https://www.google.co.uk/search?q=groot+character+designs&safe=active&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjTsq6E8bzJAhVIWBQKHSpzAzoQ_AUIBygB&biw=1280&bih=657#safe=active&tbm=isch&q=groot+concept+art&imgrc=wMvpiRb4fB1CpM%3A (Accessed: 2 December 2015).
(no date) Available at: http://static.comicvine.com/uploads/original/11113/111130081/4540832-5766571837-latest (Accessed: 2 December 2015).
(no date) Available at: http://vignette1.wikia.nocookie.net/marvelmovies/images/a/a9/Jackson_Sze_Gotg_Concept_Art_III.jpg/revision/latest?cb=20140909222710 (Accessed: 2 December 2015).