Actually, for a first time that really came out rather well. And you learned something in the process. The detail came out pretty well, just need to work on the differing thicknesses. Some of that void near your sprue is because of shrinkage of the material in your casting as it cooled. Might need to use a taller and larger diameter riser to compensate. And maybe the riser needs to feed out towards those ends that did not fill well. What happened suggests that you could also have cooled off you rmetal too quick and it was not able to flow out into those areas, but it could also be that you need to pour more metal.
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