Hmm. Being sincere, I don't think that there's any 'kind' of 'ownership' problem as long as you **properly** credit your 'friend' (by clicking on the 'Users & Credits' option on your 'project-details' form and putting their respective username, and what have they 'exactly' done.)
Now well, in case that you still feel 'doubtful' regarding this topic, feel free to contact via PM with a Moderator of the Art Portal, for 'further' (and more 'precise') help and information, respectively. Here do you have the list of the Moderation Team, at the following link:
Gekkotsuki
Hmm. Being sincere, I don't think that there's any 'kind' of 'ownership' problem as long as you **properly** credit your 'friend' (by clicking on the 'Users & Credits' option on your 'project-details' form and putting their respective username, and what have they 'exactly' done.)
Now well, in case that you still feel 'doubtful' regarding this topic, feel free to contact via PM with a Moderator of the Art Portal, for 'further' (and more 'precise') help and information, respectively. Here do you have the list of the Moderation Team, at the following link:
(https://www.newgrounds.com/wiki/help-information/site-moderation)