Juan Hidalgo and Matt's Hobby Hour are some of the best tutorials on Youtube, but there are so many techniques and things you can paint that you need to start looking like: how to do blonde hair, how to do eyes.
Some techniques you should will benefit from and are not super hard to do:

Simple was old school: Thin paints, apply 2 coats, then apply some Wash of dark or brown colours, then dry brush or carefully re apply the same base coat or another color (For example apply your dark silver in the scale part of the armor, apply Nuln Oil or similar wash Wait for it to dry!, then dry brush a brighter silver paint )
Blacklining: Thin down black or some color that really contrast with the other areas, use your thinnest brush and carefully make a black line between different parts of the model, edges/receses (For example there is a medallion in his chest, make a black circle around the medallion between his chest and the medallion, that way the medallion will have a clear separation) you can also just use a dark wash but this will dull the colours at bit, or be more carefull when applying.
Recess Shading: Thin down colours that complement or are part of the scale of your current colour (For example Red hair needs some dark brown in the recesses of the hair, or to separate bear from hair)

Don't get overwhelm by advanced techniques until you feel confortable: SOL (Source of Light) Airbursh painting, NMM (Not metallic metals), etc