Click on your name, either in the online list or through the forum. This will open up your profile. Then, scroll down towards the bottom. It'll say Freeskimartini's media. Underneat that, click on Pictures. It'll now show the pictures under your name. Over to the right of the picture name is an ''X''. Click on the x. The picture should be removed.
Also, mods are able to remove posts as well as pictures. If they aren't too busy you can get in contact with them and kindly ask them to remove it. Or just leave a comment in the picture saying 'Please remove this photo'. They should do it for you to.
Eat. Sleep. Breathe. Ski.