you have bad composition in here
render is too small
no blending
effects are off, they are just slammed on bg
no focal point
no depth
monocolor
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if you are newbie, start with smaller canvas, it is easier to fill it, here is too much space, watch some tutorials to learn making of effects
I would recommend to transfer render closer to the center, make some blending with smudge, blur sides a bit, to make depth and add more effects