The moulded detail looks a little soft. You may consider taking a pointy blade and slightly under-cutting the collars, belts and straps, pocket flaps, etc. If you can afford it you could replace the heads with Hornet or Alpine. That will also make a big improvement. If you have any Dragon Gen ll German equipment to replace the original items, that will also make a big difference.

When painting black clothing, start with dark gray or charcoal as a base color. Then you can shade with black.

Your figure looks pretty good, but you were a little messy with undercutting. Instead of cutting straight into the surface, try aiming the tip of the blade upward and under the edge you are undercutting. Use a SHARP pointy blade and don't use too much pressure. A few passes will result in a neater job. As,it is you have some point slips and burred edges. Before going any further I would suggest using a small hobby file or sandpaper and de-burring the rough edges of your work, otherwise they will really stand out after drybrushing. As for paint stripping, Windex works great on Tamiya paint, but Vallejo probably requires some elbow grease (and Windex) with an old toothbrush.