Its a bit patchy looking, but its early days yet as its only just up.
From the pictures it looks as if quite a lot of stones are poking through - pick them or risk damaging your lawn-mower or injuring someone.
Get a box of ready-mixed lawn-seed and fertiliser (Dunnes, Woodies DIY, B&Q, HomeBase), loosen the soil in the bald patches with a fork, sprinkle in lawn seed mix and cover over. Tamp the soil firm with your shoe.
When the new grass begins to sprout, set you lawn mower to its highest setting and give the lawn a once over. Leave it for a week and do it again.
Some of the grass looks like it might be dying - what's drainage and original soil quality like?
Is it my imagination or is the lawn saucer shaped (high at the edges, low in the middle)? If it is you will have ongoing problems.
The next job is a PITA. Pull weeds daisies, dandelions, docks, thistles (all have huge root systems) or treat each weed idividually with a systemic weed-killer from a squirty bottle. Treat white and purple clover with a dilute water-on weed-killer from a sprayer (more accurate) or watering-can with a very fine rose.
Before the advocates of meadow or wild-flower gardens lynch me, I need to explain that if you want a lawn of nice even, green-coloured grass (which is essentially an artificial creation), the other plants have to go as they (particularly the broad-leaves) will kill the grass either directly by over-growing or indirectly by robbing the grass of nutrients.
In the autumn, use an autumn lawn feed. This is nitrogen poor and feeds the root system. Next spring use a nitrogen-rich lawn feed which will turn the grass green, but don't over-do it or you will be cutting the grass every other day and then it will die back fairly quickly, unless you feed it again.
When using any lawn treatment, avoid cutting the grass for at least three days beforehand and three days afterwards. Don't compost the roots or flowers / seeds of weeds or any plant material that has been treated with weed-killer.
HTH.