Well, they can always be better. Take a look to the samples up there, for only 5$ I will enhance 10 pictures, and give them a great look.
I've been doing this for several years, and all my customers are always amazed by the changes I do to their pictures. I've also worked with professional photographers who just wanted a better quality job.
I do this with Photoshop, a professional tool that allows me to apply filters and change different parameters depending on the situation.
If you need further information, do not hesitate to contact me. Thank you.