Is this your own original work? It is just someone else has previously posted this on steemit claiming it is their own: https://steemit.com/art/@sabirisgd48/water-painting-colorchallanging ? There are youtube videos to help you recreate this, so it may be that you both used to same tutorial, but both images do have this artists signature on them. - it is different to the one in the video so it may be that you painted this from the video and the other user stole it - if you use a tutorial, it may be worth mentioning so people don't think you have stolen something and flag you :)