Then just mention the tutorial you used and you should be fine, so this means you are the alter ego of the fantastic Vilas Kulkarni?! I knew I recognized that signature - I am following you on facebook https://www.facebook.com/vilassir/ :)
This is the other user who has also posted this art so you can flag it and prove it is yours:
https://steemit.com/art/@sabirisgd48/water-painting-colorchallanging
i wouldnt say alterego his art is way better then mine could ever be
The picture you posted has his signature in the corner...?
Just make sure that the pictures you post are your own, or if they are not, they need to be copyright free/open source, and you just need to credit the original artist :)
As long as you are clear, people tend not to mind, I think it is just because you can earn money from posts on here, people flag things when they don't think they are yours.
More looking to help you not get flagged in future than wanting to accuse or anything :)