it's not that badI'm also learning so it's pretty awesome that you were able to create one this good.
its cool it a lil bright and the render itself is a lil squished but ull get the hang of it i use photoshop and all i do is hold shift while i resize and it keep it good i dunno how u do it in gimp tho but i sure if u ask a gimp user they can tell u
Too high blur setting.