Given that it is a hand needled "soft" sculpture, the fibers will tend to come loose on the surface with too much handling, so keep that in mind. You can trim loose fuzz with small manicure-type scissors...very carefully...to maintain the smooth surface.
Also, remember that the more you handle it, the more your natural skin oils will transfer, which attracts dust and turns it into dirt, which is hard to remove without roughing up the surface.
I create art pieces and sell my pieces for decorative and collector purposes, for display. I've chosen to specialize in making original, unique, one-of-a-kind art dolls and figures. I have some fun items, too, that can be handled a little, or used for fun, but my passion is for art figures, which are posed and static.
Many needle felted characters are made around wire armatures, which makes them able to be posed in various positions. The nature of wool is such that pose-able characters will need to be maintained, or their wool will get pulled, matted, and frizzy. There are advantages of figures that can be posed (such as for stop-motion animation videos, or photo props), and I will have some of that type available from time to time, but my "bread and butter" (and passion) is for art figures that are designed, posed, and for display.
Needle felted items can be made for many purposes and for varying durability. When heavily felted it is definitely more durable, but generally the more firmly it's felted, the less details can be included.
The thing about calling them toys is, a toy is generally handled a great deal, pulled and flexed. Being natural wool, it is durable, and naturally flame resistant (it is self-extinguishing). It's also water resistant. However, it is wool, and still a semi-living fiber, so it will tend to "shed" or pull loose with handling. With its unique properties, needle felted wool is best if not considered toys. Playing with it is at each owner's discretion and choice.
So, my best tip and advice is, when shopping for needle felted items, know what you want to use it for, and be sure the artisan who created it felted it for that use. Know what you want, know what you need, buy from an artist that knows how to use wool. Then you have a remarkable art piece that will last generations!
Ideally, display your new art piece in a closed (air tight) display or collector's case out of direct sunlight.
However, that is not always practical, so the next best thing is to remember these tips:
Fresh air, good light and lack of dust will keep most moths and pests away. But if you need more prevention, essential oil is a great deterrent to pests. Cedar/cedarwood, eucalyptus, lemon/citrus, and peppermint are all great at keeping little bug and insect invaders away. I don't recommend putting the essential oils directly on your sculpture, as the oil can draw dirt and quite probably cause a stain over time.
The best ways I've found to keep needle felted pieces dust-free is to either gently vacuum, or use a gentle air source to blow the dust off.
To vacuum, use an attachment hose or extension, and put a thin sock, nylon stocking, or something similar, over the end (and use a drapery setting if you have one)--but don't set the hose right on the piece. Hold it above the surface a little bit.
The other option is blowing the dust off. Some feel this could blow dust into the fibers, however, I've found that if it's a fairly gentle air stream, and you aren't blasting air straight into the piece, it's fine, and is great for keeping the dust off so it doesn't become built up. It's my favorite way to do "light dusting." Some like to use canned air, like that for cleaning out computers, but my preference is a manual air blower, like photographers use on their camera lenses. I have a Rocket Air Blaster that I use; it shoots out nice, quick little bursts of air. I use it regularly, and it makes for fast (and fun) dusting maintenance.