Ok, although I like sarcasm, I'll try to be constructive (although perhaps I will seem destructive...). An analysis of issues may help in growing.
This one is simply a mess, too much things inside, and partly overexposed. It also does not play well as wallpaper, for me, because all such colors make difficult to see file icons.
This one has a too distracting background (google for "bokeh"), harsh light (I suppose shot at noon: goggle for "golden hours"), and finally there is no composition (google for "rule of thirds"). By the way the top flower is cut.
This one, in addition to the same considerations as above, is overexposed. Macro and close-up photographers typically prepare their field, moving away disturbing objects like the leaves coming out from the flower.
This one is severely overexposed, leaning, but both are not real problems because there is no real subject in the picture:
This one seems slightly out of focus, altough, being a close-up, focus should be crucial. I have many pictures of this kind: I use them to check resolution of old manual focus lenses I buy on
Ebay. Posterization on sides is a bad idea.
Unfortunately this exercise can be done for most pictures.
One I could not choose as a wallpaper but with some potentiality is the following. I suppose you have such place at hand: I would come back trying this time to have more DoF, in order to make in focus also (also, not only) the rock in the middle, where the eye goes, but finds a slightly blurred rock instead of a crispy detail. Of course, also some more attention in composition is needed (please do not cut objects on borders unless with a specific reason). A place where to find some basic rule is here:
http://www.amateursnapper.com/photography/10-top-photography-composition-rules .
Apologies for having been honest.
If you feel comments here are unfair, you perhaps know there are a number of stock photography sites where photographers may place their pictures for selling them. Try to submit your work to their selection process (there are hundreds of thousands photographers inside, so is not a restricted club): if there is some commercial value, it will be surely recognised. You then will have a sort of external validation process that in an attempt of business might have some value.