You can delete your own photos by going to Caedes Control and clicking "delete" or do it from your gallery page, open a photo and click delete. You have some great flower photos, I hope you keep some of them here.
Steven (and pretty much anyone), if you notice that some of your images have lived in the "new images" gallery long past their (approx) 1 month shelf-life, feel free to pm a mod and give them a nudge that the gallery needs tending. Please remember when you do it though that all the mods are volunteers and often are keeping up as best as paying jobs and lives allow. 8•)
Just nudge any of the recently active ones. Most likely thing is no one has noticed (or those who have noticed haven't had time and figured that somebody else would be on top of it) that it needs taking care of. They can relay to the others and somebody is sure to make it a priority.