couple of things i noticed:
• when you throw your combos you drop your left hand a bit when you throw a right.
• you tend to lean in when you throw an elbow, meaning you are vulnerable to an uppercut or a knee. Try using your feet to close the distance instead
• when you are moving round the bag you bring your feet together 'a lot'! that means if you get tagged when you are moving you are going to go down because your balance will be off.
looking good for only being training a short time though dude. good job