What he has done so far looks pretty good, the amount of colour is not too bold and in your face as some sites I have seen which means its easy on the eyes for finding the info you want.
I personally would have maybe lost the right hand column and put the news, contact and opening hours as headings in the left hand menu, that way you have a few more pages of content and allows a little more space to be adding small images or logo's of products that you use along side the text within your site, its not a must but maybe worth thinking about.
Also I do like the name and logo, nice to see a bit of styling rather than just picking a type font that you like and thats it.
Perhaps play with the logo and give it a bit more texture or definition against the background as the yellow part is a little lost but I am sure your son has already thought about this as it takes time to put up what he has done so far and then its just going back over it and trying slight changes to improve it.
I built our salons site back in january, not changed it since even tho there are some bits I would tweak but as we seem to be getting approximately 4-5 phone calls a day from new customers then I am in no rush but still aware that its not perfect.
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