Scale and modify image areas

I want to achieve the results as shown in this image

Scale the selected area and embed some object. Please let me know which technique is best.

Cheers

Edit

Comments up!

Q1:Are you trying to modify ONE image, or several?

Several.

Q2:What image libraries do you intend to use?

It is my question, which i should use.

Q3:Do you want a completely automated process, or a semi-manual is OK?

I shall mark the area on face to scale and then select the object of my choice from a list, one image at a time.

Q4:What parameters do you want to specify?

Dimensions of selected area of the face and the object to insert (like orange in this example) –

Q5:Are you aware of face recognition algorithms?

I believe i don't need recognition algorithms because i 开发者_运维技巧am selecting the area on face manually. All I need to modify the selected area as shown in the sample image. –

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I guess the obvious answer of use Adobe Photoshop is out of the question?