The images are at times a little dark. Be aware that you are viewing them on a computer screen, cell phone, etc.  The visibility may be affected by your settings, time of day or even your location.  Often, viewing them in a less lighted environment helps.

If they are really too dark, then I need to make adjustments to the images. At times I created items that looked good only to come back the next day and wonder what happened to them.  Too dark or too light! I may have been affected by the same conditions.

One other note! While you can certainly look at them on your phone, I think you will find the experience much better when viewed on a larger computer. Some times, the extra space is just better.