Mainly your choice of notes could use improvement in several places which would create better melodic lines. Unfortunately I can’t go into detail here.
Also, try not to start a new chord on a 5th for now. You want to imply the harmony by voice leading to guide tones at the point of chord change (which you are doing most of the time). Down the road you’ll be able to incorporate 5ths as starting notes in the proper places. However, if you choose to do so, always include the 3rd in the measure!