Firstly I thought we should look at the correct letter formations. Different settings use slightly different standard formation so if your child is attending nursery or school it is worth checking with their teacher or key worker how they are teaching the letter formations.
A sample alphabet with formation arrows is shown here:
This is a cursive formation (in preparation for 'joined up' writing) therefore there are flicks on the letters, these may be omitted by younger children (in particular the ones on the o, the v and the w). Other letters that may often formed differently are f, k, t and y.