Not sure if you used acrylics or enamels, but you could try the appropriate thinners on a cotton bud and gently wipe the paint off. May take 2 or 3 goes depending. This would give you more confidence in feeling you can retrieve situations and also means I'm now confident at buying some 2nd hand attempts where I feel I can do better by getting something cheaply and breathing a bit of life into it. Do give up too easily!