As long as the inside of the lip of the frame is smooth, all is well. If you need a bit of extra holding power while the work is drying, use office paper clamps, clothes pins or even push pins pressed into the wood to help hold the wayward ends in place. Regardless of whether you are using paper, leather, cloth, ribbon, or leaves, it is usually advisable that the material completely cover the frame. In the case of natural items, like ferns or leaves or flower petals, a bit of the frame color might be allowed to show through and become a part of the color pattern. The tone of the frame and the items being mounted should be similar, as contrasting tones compete for visual control.
Similar tones are very pleasant and seem to be more natural.
With these tips and many you will discover through your own experimentations and surprises along the way, you will surely develop a technique that is your own. Whether your goal is to show at exhibitions, sell your work in a gallery environment or salon atmosphere, or decorate your home or office, any of the frame decoration ideas mentioned above might help you achieve the personal statement you desire.