There is already a thread about this inconsistent reviews from SS.
Use it.
http://www.microstockgroup.com/shutterstock-com/inconsistent-reviewing/25/?topicseen

Show us the pictures.

" [I cannot include now images - only tonight] "

I came up with few images. Just to make an idea.

Yes you definately must keep the ratio!

A tripod will help you much, I remember when I bought one ( the same as yours), back in 2002, I found out that I could now photograph everything and get et sharp, unless it moved much.

With a tripod you have a much greater range of shutterspeeds and apertures to choose from, and you can use that in a creative way that suits the subject.
You can use aperture 13 and get the whole landscape reasonable sharp, or you can use a 5,6 to get only a part of it sharp.
When you photograph a statue, you might want to blurr the background, and compose the frame so it becomes less distraction. Many of you photos have distracting backgrounds. Your chouce of composition, lens length and aperture is important, to get the main subject to fill the frame and to have the remaining elements and lines support the main subject and not distract from it.

Take a look at this image:


The composition is very confusing: the most important statue has a "tree in his head", in form of a brick corner that is placed right behind him, and other statues are cut in halves and very small in the picture. I can see you have used a wide angle lens, but maybe not wide enough or maybe you should have used a tele from a distance. To get the elements more equally sized, since all the elements are important fort the subject.
The light is dull and uncontrasted, which is normally good, but in this case it makes the details difficult to resolve, and it is also uneaven, and the statue is lighter than the tainted ones, so it looks like its a bit overexposed. Which it isnt, it just looks like that.
Next thing. Think of the customer. You have photographed a fountain somewhere, but the customer, can barely see it is a fountain, and certainly not where. Try to imagine what picture a travel agency would need to make the travellers want to travel to that place. That wouyld not be such a flat, difficult to identify image. But maybe one with more background, dramatic light or pretty girls in it.
I suggest you retake it, and do paint with light, double white balance, HDR or something, and a composition that either focus on the elements ( those can be sold to statue collectors or historians, of which there are not many) or on the whole fountain with its surroundings + add life in form of humans.

Sorry, in Romania Black Friday started last night. So I was kept by the event. I just bought a nice Manfrotto tripod 190xprob with 496Rc2. Hope I will not have any longer the problem with blurs and focus.

Like Jens says, your tripod will help prevent camera movement, but will not help with subject movement (statues won't be a problem!) or poor focus.
If you have IS/VR in  your lenses, check if they should be switched off when used on a tripod.