Making an Advert in Photoshop

Today in Photoshop, i started to create my photography advert for a magazine. I Googled the sizes for a standard magazine size which is 8 by 10 then continued to make my advert. I used my own image of the cat food and used the curve tool to make the background pure white so it was easier to delete the background. I then Googled the rest of the images to make my freaky advert. Though it isnt completed yet, i reckon the final design will be unique and of good quality (hopefully). The final design is supposed to have blood dripping down the stairs, then end as a puddle at the bottom where the cat collar is. Above the collar will be the slogan which i have not decided on yet. There is also going to be glowing cat eyes at the top of the stairs and multiple hands outstretching towards the screen with one hand holding the cat food. Above the glowing cat eyes will be the headline of the cat food and possibly a logo. I hope to achieve something of good quality that it looks as if it just came right out of a magazine, though my knowledge for certain tools in Photoshop lacks, i believe i am capable of making an advert that ties in well with the theme.