This looks really good for a first gfx.
It looks a bit to bland in my opinion.You should add some effects maybe some watermarks,Or even change the character to fit the theme.
It’s good but probably make the background roblox instead of an real life image. Also the right leg is a little bit out so might want to fix that and the head is a little transparent.
I completely agree with you! 
Background is un natural, limbs seem a bit unposed, other than that good job for your first 
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