yeah, you should try previewing or colorpicking from dragons made from the onsite scryshop, it wont be a surefire way to get people to buy, but i think it would help- sometimes a color being a few shades off turns people off from buying. hypefishing has worked for me historically too, but i avoid publishing skins towards the end of the start of the month- since those times tend to overlap with fest skin rejects.
by the way, if you draw on a canvas that isn't 350x350, i recommend using photopea to resize it to 350 and use the bicubic sharpener resizing option when you go into image size. its a lot better than most art programs resizing tools.