The skeleton looks extremely outplaced - as if it were walking towards the camera perspective not the character. The effects on the sword stand out just a tad too much (this is my opinion, others may think differently) and the cape on the left character is to the left and not centralised. Other than that, it's a good banner. Practice makes perfect, after all. Try using Photoshop CS6/2015/2016 for your effects as it's easier and you have a larger array of effects to use.