Half white nail beds like you have may suggest that your body is low in iron. This is the supplement that is commonly found in red meat which is important to maintain healthy blood cells which helps the immune system. It may also point towards kidney issues.
There are many other issues that the nails can highlight. People with heart disease may have redder nails than normal and people with obsessive compulsive disorders may have broken, bitten and picked at nails.
Even thyroid disease effects the nails and can cause issues out of the ordinary. It may produce dry and brittle nails. Yellow nails can mean emphysema and lung conditions.
Irregular lines at the base lines or folds can mean lupus, whereas dark lines beneath the nail can mean melanoma.
Pitting or ripping of the nails can be a sign of the skin disorder psoriasis, and yellowish nails with a blush at the base may hint at diabetes.
All of these diseases are hinted at from merely a nail colouration which is quite an amazing thing.
If you do end up with nail issues, then perhaps you should go see a dermatologist. If you have other considerations then perhaps go and see a doctor. They can determine whether the issue at hand is merely a minor problem or the sign of something a lot more serious.
Always check with a professional before you make any diagnosis yourself as you would not know. If you feel unwell then always go to a professional over someone who is not a registered medical professional.