Hi @Anoop0101 ,
I like your composition. However there is a number of issues with your photos. To see these issues, please zoom to 100%.
There is not sufficient depth of field. For that reason some areas, the edges are soft. For example the edges of the mitten on the babies hand is not defined. It's soft.
There is also color noise. Look at the hair of the little boy. Its blue green and black. It should be all black. Luminance noise is also present. And especially around the edges of the subject, is extremely noisy. There seem to be distorted pixels as shown int he faces.
You need to use a photo editor such as Photoshop to make corrections of your photos. You use this to correct exposure, white balance, clean noise etc, and also to remove IP items for commercial uploads.
The histogram is divided into five sections, right to left, white, highlights, exposure, shadows and blacks. It mainly tells you about your photo. If your photo is low key (having a lot of dark, and shadow areas) then it would peak at the left. If it is high-key, (having a lot of white and/or highlights}, it will peak at the right, and sometimes clipped at the side and top. The whole idea is to make sure your photos does not have so much highlights, or dark areas so that details are lost, and also to make sure the exposure is ok. Try to get exposure centered, but at the same time if you have a photo with white background you may have a slight peak towards the right in the white segment. The converse is true if your photo is mainly black, or shadowed. Large clipping at the sides and tops are indication to correct the relevant fault, be it highlight or dark/shadow, but there is no ideal settings that fits all.
Best wishes
JG
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