>>3651511>What does one recommend to get more even lighting when taking a picture on the bed?By not using a disposable camera. They usually only have one shutter speed and one aperture setting, meaning that those setting will not always be ideal for every scenario. Even a compact point and shoot will automatically adjust the setting to make sure the flash doesn't overexpose everything.
You can also do what the what the other anon said and bounce the flash off the ceiling or you could get a soft box/diffuser for your flash, with either of those ways you'll need to buy an SLR camera and a dedicated flash unit.