50 photos retouched, 7 with hair colour changes

I am looking for someone to retouch/edit 50 photographs, of which 7 will involve a hair colour change. The accompanying photos are samples from the set, the second of which is an example needing a hair colour change. (Darkening blond/light brown hair to match roots - hair should look consistently dark brown.)

In terms of other editing, I am just looking for light re-touching, e.g. basic corrections for brightness, contrast and colour + minor clean-ups like reducing frizzy/stray hairs, etc. - just enough so photos "pop", but nothing that would look like it had actually been edited (not expecting everyone to come out having porcelain skin).

Some photos will require more re-touching than others - I will be relying on your judgment to do what you think each needs to look good (which might be very little in certain cases). Idea is to bring all the photos up to a consistent look/standard (intention is for them to be viewed online as an album) - am not looking for someone to do heavy edits to 50 images.

Please include examples of your work in your proposal and ensure that your bid price is a fixed price for the job as described.