CD artwork - Alter/combine photographic images

This is photo artwork for a CD of piano music. I have 3 images of butterflies. What I need is for an image of piano keys to be photoshopped into each of them to replace the pattern on the wings. I have several images of piano keys to use for grabbing details, though of course you are able to source piano key images from elsewhere, provided you have the right to use those images. I believe the black keys should be on the outer side of the wings, while the white should be close to the body but we may find a better look through experimentation. In addition, I will need those piano butterflies to be added as elements to about 4 other pics (photos of models/tango dancers). There will also be a few easy changes to be made to those photos, such as changes of colour scheme and light levels. The final images will need to be high-res (though not the maximum) which may require some photoshop trickery too. I include one of the butterfly images and one of the piano keyboards as an example. (Please note: I may ask shortlisted freelancers to complete a quick test combining the two images. Feel free to watermark these test images so I can't use them. However, if you don't want to do this, then please don't apply - please understand it is not always possible to judge people's abilities from their portfolios.)