thats one of the subjective things.. for example I dont like when someone just share a picture he found somewhere on internet.. look at this for example.. I searched in art for new posts.. and I couldnt find anything I would really like to upvote.. there werearound 7 posts by different people one by one just pictures and headlines.. In some cases I dont know if they painted it, or if it is their photo, or what is it about.. but your posts are different.. you create, so thats the value.. I would add some signature at the end.. or something short about you, so people would know who are you and that this is your work.. it looks more professional if you have some simple nice and informative footer..