Any advice welcome

I was asked to shoot my son's year 6 farewell. I'm happy with the shots as tiffs and they print fantastic, but as uploads they just don't cut it. I am using the frame action someone sent me (THX again) because I get a better result that way. I just can't seem to hold the sharpness when PP'ing for an upload...any suggestions here?
Also feel free to comment on lighting, crop or any other aspect that might better the result.
They are all shot with D70, 18-70 kit lens and SB800.
Also thanks to those who commented on my Team photos lens post. I have not been online lately but will look into all your suggestions over the Christmas break.
Also feel free to comment on lighting, crop or any other aspect that might better the result.
They are all shot with D70, 18-70 kit lens and SB800.




Also thanks to those who commented on my Team photos lens post. I have not been online lately but will look into all your suggestions over the Christmas break.