Guest post: Emma Davies
You've got your photos against a white background; trouble is, the white background is a bit grey. Don't panic, it's a quick fix.
Here's how fix a grey background in Lightroom:
If you don't have Lightroom, try using the 'Brightness' filter in the free photo editor Canva.com. You don't get the same degree of fine control - it brightens the whole image not just the whites - but it's better than a gloomy photo.
More image editing tips at: emmadaviesphotography.com