The thumbnail makes a difference. I've found that since tapas is a comic format the visuals even for novels attract readers. I did mine like a book cover and will probably remake it if I have time later. There's also the matter of volume, Tapas won't recommend your work unless it has a certain amount of chapters or pages.
I got the majority of my readers by throwing my novel out on the forums which you can do without begging for views. Its the best way to be seen when your brand new.
Hope this helps and welcome to Tapas!