Doing well there, Great start, Yes the headlight will work well, At the light awards grand final we were given the gear to shoot with and no speed lights, but I did hae ahead light as our instrustions were to bering a torch so it wasn't out side of the rules as we were asked to bring one so jsut using a head light like the one you used there I mangaged this. The trick with lighting is to make the light appear sofe so you need to get teh light sourse as close as possible while keeping it out of shot, or making it as big as possible by adding some sort of diffuser to the light sourse like a piece of tissue paper etc, it may be enough, the next trick is to adjust the power of the light which then becomes a distance thing so to reduce the power move the light back a bit it doesn't take to much to makea difference. But your certainly on the right track using the light, try the light about 75 Deg to the axis of the camera lens to start with, maybe a piece of aluminum cooking foil to act as a reflector and you have two light sources to play with. Maybe next tmie I'll do a shoot wiht the same set up a headlight and foil and see what I can come up with. Always fun to play around and see. Looks like your yard is wonderland for Mushrooms at the moment, bit warm here quite a few days over 40 deg C here now, over the 100 Deg F mark for those that use that scale. Not great for Mushrooms. But a headlight is enought to achive all sorts of magic as shown here only one headlight used on this shot. Try underexposing the shot firs then add the light, if your using a DSLR and not a mirrorless (I still use DSLRs) the use live view to see what your doing light wise. Once you master light focus stacking is next, its suprisingly simple if you have Photoshop its pretty much automated. Great t see what your coming up with in your yard.